Customize field/subtype name comparison during macro expansion

[MateuszKubuszok]

TODO:

• obtain object by its type in the macro (based on https://github.com/MateuszKubuszok/MacroTypeclass)
• replace each usage of ProductTypes.areNamesEqual with ctx.config.flags.fieldNamesComparison
  • consider some utility which would provide global areFieldNamesEqual delegating to the code above
• replace each usage of enumNamesEqual with ctx.config.flags.subtypeNamesComparison
  • consider some utility which would provide global areSubtypeNamesEqual delegating to the code above
• tests
  • custom fields names matching
  • custom subtypes names matching
  • build-in comparators
  • error messages when a comparator cannot be read
• mkdocs
  • enableFieldNamesMatching + disableFieldNamesMatching
  • enableSubtypeNamesMatching + dsableSubtypeNamesMatching
  • TransformedNamesComparison
• scaladoc
  • TransformedNamesComparison
  • links to mkdocs

[codecov]

Codecov Report

Attention: Patch coverage is 91.80328% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 90.02%. Comparing base (530d7fe) to head (c7aff77).

Files	Patch %	Lines
...ey/internal/compiletime/ChimneyTypesPlatform.scala	66.66%	4 Missing ⚠️
...io/scalaland/chimney/dsl/TransformerFlagsDsl.scala	50.00%	4 Missing ⚠️
...ey/internal/compiletime/ChimneyTypesPlatform.scala	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #478      +/-   ##
==========================================
+ Coverage   89.85%   90.02%   +0.17%     
==========================================
  Files         124      125       +1     
  Lines        4602     4663      +61     
  Branches      375      393      +18     
==========================================
+ Hits         4135     4198      +63     
+ Misses        467      465       -2     

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