Eachkey fix

[floren]

Description: What this PR does
Per #56, EachKey cannot handle a variety of cases where there are more than 64 keys, or 64 elements in an array we're extracting. This fixes that.

Note that the PR template's command for running benchmarks (go test -test.benchmem -bench JsonParser ./benchmark/ -benchtime 5s -v) doesn't work, so I instead added a replace directive in the benchmark/ directory's go.mod to point at my checked-out repository, then ran go test -bench . against the master branch, then against my branch.

Benchmark before change:

goos: linux
goarch: amd64
pkg: benchmarks
BenchmarkDeleteSmall-16                         	 1890744	       622 ns/op	     256 B/op	       3 allocs/op
BenchmarkDeleteNested-16                        	 2652386	       445 ns/op	     160 B/op	       2 allocs/op
BenchmarkDeleteLarge-16                         	   27751	     42538 ns/op	   32976 B/op	       4 allocs/op
BenchmarkJsonParserLarge-16                     	   22432	     52544 ns/op
BenchmarkEncodingJsonStructLarge-16             	    2826	    375274 ns/op
BenchmarkEncodingJsonInterfaceLarge-16          	    1760	    652624 ns/op
BenchmarkFFJsonLarge-16                         	    7461	    161655 ns/op
BenchmarkEasyJsonLarge-16                       	   14215	     86164 ns/op
BenchmarkDjsonLarge-16                          	    2882	    394393 ns/op
BenchmarkJsonParserMedium-16                    	  142406	      7983 ns/op
BenchmarkJsonParserDeleteMedium-16              	   66177	     18689 ns/op
BenchmarkJsonParserEachKeyManualMedium-16       	   95619	     12839 ns/op
BenchmarkJsonParserEachKeyStructMedium-16       	   86356	     14061 ns/op
BenchmarkJsonParserObjectEachStructMedium-16    	  135129	      8601 ns/op
BenchmarkEncodingJsonStructMedium-16            	   41817	     29282 ns/op
BenchmarkEncodingJsonInterfaceMedium-16         	   28939	     41163 ns/op
BenchmarkGabsMedium-16                          	   28653	     44121 ns/op
BenchmarkGoSimpleJsonMedium-16                  	   24699	     48544 ns/op
BenchmarkFFJsonMedium-16                        	  111526	     10672 ns/op
BenchmarkJasonMedium-16                         	   22724	     51735 ns/op
BenchmarkUjsonMedium-16                         	   35376	     33149 ns/op
BenchmarkDjsonMedium-16                         	   50370	     22166 ns/op
BenchmarkUgirjiMedium-16                        	   23074	     48843 ns/op
BenchmarkEasyJsonMedium-16                      	  196198	      6132 ns/op
BenchmarkJsonParserSmall-16                     	 1514832	       800 ns/op
BenchmarkJsonParserEachKeyManualSmall-16        	  731673	      1487 ns/op
BenchmarkJsonParserEachKeyStructSmall-16        	  866870	      1819 ns/op
BenchmarkJsonParserObjectEachStructSmall-16     	 1551387	       773 ns/op
BenchmarkJsonParserSetSmall-16                  	  647980	      1738 ns/op
BenchmarkJsonParserDelSmall-16                  	  495890	      2819 ns/op
BenchmarkEncodingJsonStructSmall-16             	  275402	      4455 ns/op
BenchmarkEncodingJsonInterfaceSmall-16          	  222865	      5003 ns/op
BenchmarkGabsSmall-16                           	  229048	      5471 ns/op
BenchmarkGoSimplejsonSmall-16                   	  197372	      5861 ns/op
BenchmarkGoSimplejsonSetSmall-16                	  204316	      5694 ns/op
BenchmarkFFJsonSmall-16                         	  406246	      2480 ns/op
BenchmarkJasonSmall-16                          	   75861	     15973 ns/op
BenchmarkUjsonSmall-16                          	  305860	      3912 ns/op
BenchmarkDjsonSmall-16                          	  433152	      2723 ns/op
BenchmarkUgirjiSmall-16                         	  259401	      4575 ns/op
BenchmarkEasyJsonSmall-16                       	 1151031	      1021 ns/op
PASS
ok  	benchmarks	59.982s

Benchmark after change:

goos: linux
goarch: amd64
pkg: benchmarks
BenchmarkDeleteSmall-16                         	 1908750	       628 ns/op	     256 B/op	       3 allocs/op
BenchmarkDeleteNested-16                        	 2525209	       463 ns/op	     160 B/op	       2 allocs/op
BenchmarkDeleteLarge-16                         	   26755	     44093 ns/op	   32976 B/op	       4 allocs/op
BenchmarkJsonParserLarge-16                     	   21904	     52531 ns/op
BenchmarkEncodingJsonStructLarge-16             	    2890	    376510 ns/op
BenchmarkEncodingJsonInterfaceLarge-16          	    1797	    643310 ns/op
BenchmarkFFJsonLarge-16                         	    7437	    160658 ns/op
BenchmarkEasyJsonLarge-16                       	   14097	     86033 ns/op
BenchmarkDjsonLarge-16                          	    3388	    398946 ns/op
BenchmarkJsonParserMedium-16                    	  143050	      7907 ns/op
BenchmarkJsonParserDeleteMedium-16              	   61576	     18450 ns/op
BenchmarkJsonParserEachKeyManualMedium-16       	   91599	     12510 ns/op
BenchmarkJsonParserEachKeyStructMedium-16       	   94472	     13368 ns/op
BenchmarkJsonParserObjectEachStructMedium-16    	  130995	      8881 ns/op
BenchmarkEncodingJsonStructMedium-16            	   41547	     29998 ns/op
BenchmarkEncodingJsonInterfaceMedium-16         	   28642	     41842 ns/op
BenchmarkGabsMedium-16                          	   29258	     44583 ns/op
BenchmarkGoSimpleJsonMedium-16                  	   24452	     48066 ns/op
BenchmarkFFJsonMedium-16                        	  110073	     10582 ns/op
BenchmarkJasonMedium-16                         	   22927	     51748 ns/op
BenchmarkUjsonMedium-16                         	   36816	     31486 ns/op
BenchmarkDjsonMedium-16                         	   54476	     22146 ns/op
BenchmarkUgirjiMedium-16                        	   24409	     51023 ns/op
BenchmarkEasyJsonMedium-16                      	  194780	      6136 ns/op
BenchmarkJsonParserSmall-16                     	 1530714	       781 ns/op
BenchmarkJsonParserEachKeyManualSmall-16        	  954934	      1446 ns/op
BenchmarkJsonParserEachKeyStructSmall-16        	  602458	      1699 ns/op
BenchmarkJsonParserObjectEachStructSmall-16     	 1564392	       799 ns/op
BenchmarkJsonParserSetSmall-16                  	  677536	      1778 ns/op
BenchmarkJsonParserDelSmall-16                  	  393672	      2814 ns/op
BenchmarkEncodingJsonStructSmall-16             	  253527	      4668 ns/op
BenchmarkEncodingJsonInterfaceSmall-16          	  218199	      5077 ns/op
BenchmarkGabsSmall-16                           	  213379	      5588 ns/op
BenchmarkGoSimplejsonSmall-16                   	  203370	      5843 ns/op
BenchmarkGoSimplejsonSetSmall-16                	  188271	      5668 ns/op
BenchmarkFFJsonSmall-16                         	  414210	      2536 ns/op
BenchmarkJasonSmall-16                          	   72268	     15271 ns/op
BenchmarkUjsonSmall-16                          	  297141	      3795 ns/op
BenchmarkDjsonSmall-16                          	  508090	      2659 ns/op
BenchmarkUgirjiSmall-16                         	  267682	      4705 ns/op
BenchmarkEasyJsonSmall-16                       	 1154594	      1052 ns/op
PASS
ok  	benchmarks	59.805s

[buger]

Nice! Thank you!