Improved KMP expect/actual bindings on Android

[gmazzo]

Improved the KMP support for Android targets.

Now the source sets will be correcly bound (and named) to existing Android source sets, when applied in a KMP project.

[codecov]

Codecov Report

❌ Patch coverage is 48.97959% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.56%. Comparing base (75c3a39) to head (3f06ef3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...azzo/buildconfig/internal/bindings/KotlinBinder.kt	34.88%	28 Missing ⚠️
...zzo/buildconfig/internal/bindings/AndroidBinder.kt	62.00%	13 Missing and 6 partials ⚠️
...uildconfig/internal/DefaultBuildConfigSourceSet.kt	50.00%	1 Missing and 1 partial ⚠️
...uildconfig/internal/DefaultBuildConfigClassSpec.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
- Coverage   70.00%   69.56%   -0.44%     
==========================================
  Files          20       20              
  Lines         780      805      +25     
  Branches      196      198       +2     
==========================================
+ Hits          546      560      +14     
- Misses        162      170       +8     
- Partials       72       75       +3     

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