Add streaming function

[shamaton]

New features

• msgpack.MarshalWrite
• msgpack.MarshalWriteAsMap
• msgpack.MarshalWriteAsArray
• msgpack.UnmarshalRead
• msgpack.UnmarshalReadAsMap
• msgpack.UnmarshalReadAsArray

[codecov]

Codecov Report

Attention: Patch coverage is 60.69919% with 1023 lines in your changes are missing coverage. Please review.

Project coverage is 70.43%. Comparing base (61b0e2a) to head (2940cf3).

Files	Patch %	Lines
internal/stream/encoding/map.go	42.95%	81 Missing and 81 partials ⚠️
internal/stream/decoding/map.go	67.22%	79 Missing and 78 partials ⚠️
internal/stream/decoding/struct.go	62.24%	52 Missing and 22 partials ⚠️
internal/stream/decoding/ext.go	33.33%	57 Missing and 9 partials ⚠️
internal/stream/decoding/decoding.go	69.43%	31 Missing and 28 partials ⚠️
internal/stream/decoding/interface.go	55.37%	32 Missing and 22 partials ⚠️
internal/stream/encoding/slice.go	53.40%	23 Missing and 18 partials ⚠️
internal/stream/decoding/slice.go	72.97%	25 Missing and 15 partials ⚠️
internal/stream/decoding/float.go	39.65%	30 Missing and 5 partials ⚠️
internal/stream/decoding/uint.go	41.37%	29 Missing and 5 partials ⚠️
... and 21 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   76.73%   70.43%   -6.30%     
==========================================
  Files          38       72      +34     
  Lines        2600     5547    +2947     
==========================================
+ Hits         1995     3907    +1912     
- Misses        365      999     +634     
- Partials      240      641     +401     

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