Added support for documentation in the DSL

[gmazzo]

Adds a basic support for providing documentation (JavaDoc / KDoc) on the generated classes (addresses #86)

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (ea539e1) 80.08% compared to head (2704974) 78.60%.
Report is 1 commits behind head on main.

❗ Current head 2704974 differs from pull request most recent head 600bb81. Consider uploading reports for the commit 600bb81 to get more accurate results

Files	Patch %	Lines
...e/plugins/generators/BuildConfigKotlinGenerator.kt	33.33%	2 Missing and 2 partials ⚠️
...dle/plugins/generators/BuildConfigJavaGenerator.kt	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #90      +/-   ##
============================================
- Coverage     80.08%   78.60%   -1.49%     
- Complexity       54       55       +1     
============================================
  Files            15       15              
  Lines           236      243       +7     
  Branches         19       22       +3     
============================================
+ Hits            189      191       +2     
- Misses           33       36       +3     
- Partials         14       16       +2     

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