deprecate setdata method for fields, update unmarshal/marshal functions

[mfdeveloper508]

#279
#280
#278
#282

[codecov-commenter]

Codecov Report

Attention: 91 lines in your changes are missing coverage. Please review.

Comparison is base (b05481c) 73.95% compared to head (ffade70) 73.45%.

❗ Current head ffade70 differs from pull request most recent head 0485485. Consider uploading reports for the commit 0485485 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
- Coverage   73.95%   73.45%   -0.50%     
==========================================
  Files          43       43              
  Lines        2338     2494     +156     
==========================================
+ Hits         1729     1832     +103     
- Misses        378      420      +42     
- Partials      231      242      +11     

Files	Coverage Δ
field/bitmap.go	69.29% <33.33%> (-1.76%)	⬇️
field/track3.go	61.79% <33.33%> (ø)
field/track1.go	69.02% <40.00%> (ø)
field/track2.go	68.22% <40.00%> (ø)
message.go	74.13% <71.42%> (-0.77%)	⬇️
field/composite.go	78.70% <57.14%> (-2.09%)	⬇️
field/hex.go	72.72% <71.15%> (+4.18%)	⬆️
field/string.go	76.72% <67.92%> (-6.41%)	⬇️
field/binary.go	65.07% <66.66%> (+4.40%)	⬆️
field/numeric.go	78.74% <64.91%> (-4.41%)	⬇️

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[alovak]

@mfdeveloper508 thanks for the PR! I'll review it soon!

[mfdeveloper508]

The PR separate into #288, #289, #290