Allow declarations inherited from parents

[MateuszKubuszok]

When I was copy-pasting my solution from pipez I accidentally have one Scala version use only local definitions and the other one using all available definitions (inherited or not).

Since I need to fix this before releasing 0.8.0, to keep the old behavior I might as well fix it by allowing inherited declarations, but requiring a flag to use them. It would implement #144.

TODO:

• new flag
• keeping tab whether getter is local or inherited
• filtering out inherited definitions is flag is disabled
• tests of a new functionality
• documentation

[codecov]

Codecov Report

Patch coverage: 73.68% and project coverage change: -0.05% ⚠️

Comparison is base (7b196bc) 80.23% compared to head (8e81a57) 80.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   80.23%   80.18%   -0.05%     
==========================================
  Files         109      109              
  Lines        4128     4133       +5     
  Branches      186      172      -14     
==========================================
+ Hits         3312     3314       +2     
- Misses        816      819       +3     

Files Changed	Coverage Δ
.../internal/compiletime/datatypes/ProductTypes.scala	84.00% <ø> (ø)
...io/scalaland/chimney/dsl/TransformerFlagsDsl.scala	65.38% <50.00%> (-2.01%)	⬇️
...er/rules/TransformProductToProductRuleModule.scala	61.48% <58.33%> (-0.16%)	⬇️
...letime/derivation/transformer/Configurations.scala	77.50% <77.77%> (-0.07%)	⬇️
...l/compiletime/datatypes/ProductTypesPlatform.scala	87.36% <100.00%> (+0.35%)	⬆️
...ey/internal/compiletime/ChimneyTypesPlatform.scala	85.21% <100.00%> (+0.88%)	⬆️
...ey/internal/compiletime/ChimneyTypesPlatform.scala	70.96% <100.00%> (+0.31%)	⬆️
...nd/chimney/internal/compiletime/ChimneyTypes.scala	93.33% <100.00%> (-6.67%)	⬇️

... and 8 files with indirect coverage changes

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