Introduce schema and metadata overlays for custom resources

[thomas11]

No description provided.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (b05f9c4) 60.68% compared to head (356c043) 60.60%.

Files	Patch %	Lines
provider/pkg/gen/schema.go	55.88%	11 Missing and 4 partials ⚠️
...r/pkg/resources/customresources/customresources.go	57.14%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3086      +/-   ##
==========================================
- Coverage   60.68%   60.60%   -0.09%     
==========================================
  Files          68       68              
  Lines       11048    11096      +48     
==========================================
+ Hits         6705     6725      +20     
- Misses       3797     3819      +22     
- Partials      546      552       +6     

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