feat: array iterator

[tdakkota]

name                     time/op
DecodeBools/Callback-12   1.67µs ± 3%
DecodeBools/Iterator-12   1.47µs ± 1%

name                     speed
DecodeBools/Callback-12  574MB/s ± 3%
DecodeBools/Iterator-12  651MB/s ± 2%

[codecov]

Codecov Report

Merging #33 (4c906c3) into main (c929480) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        34    +1     
  Lines         2250      2302   +52     
=========================================
+ Hits          2250      2302   +52     

Impacted Files	Coverage Δ
dec_arr_iter.go	100.00% <100.00%> (ø)
dec_bool.go	100.00% <0.00%> (ø)
dec_null.go	100.00% <0.00%> (ø)
dec_skip.go	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c929480...4c906c3. Read the comment docs.

[ernado]

Maybe just new Decoder method like NextElem?