Two-directional transformations

[MateuszKubuszok]

• define Iso
• define Codec
• automatic derivation in AutoDerived companions after consideration - it is not needed
• automatic derivation in chimney.auto after consideration - it is not needed
• define
  • withFieldRenamed
• extract total/partial from Iso/Codec
• tests
• documentation

[codecov]

Codecov Report

Attention: Patch coverage is 97.46835% with 4 lines in your changes missing coverage. Please review.

Project coverage is 88.10%. Comparing base (a5c1e13) to head (bc4febd).
Report is 112 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/compiletime/derivation/codec/CodecMacros.scala	96.77%	1 Missing ⚠️
...nternal/compiletime/derivation/iso/IsoMacros.scala	96.77%	1 Missing ⚠️
...nal/compiletime/derivation/codec/CodecMacros.scala	96.77%	1 Missing ⚠️
...nternal/compiletime/derivation/iso/IsoMacros.scala	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #547      +/-   ##
==========================================
+ Coverage   87.98%   88.10%   +0.11%     
==========================================
  Files         138      148      +10     
  Lines        5536     5683     +147     
  Branches      470      475       +5     
==========================================
+ Hits         4871     5007     +136     
- Misses        665      676      +11     

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