🚸 Deprecate Schema.add_optional_feature() in favor of Schema.add()

[falexwolf]

The old syntax remains available deprecated.

[github-actions]

Deployment URL: https://6d4c74d9.lamindb.pages.dev

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.95%. Comparing base (43a1701) to head (8ce80e7).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
lamindb/models/schema.py	92.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3822      +/-   ##
==========================================
- Coverage   91.52%   86.95%   -4.57%     
==========================================
  Files          88       88              
  Lines       15723    15751      +28     
==========================================
- Hits        14390    13696     -694     
- Misses       1333     2055     +722     

Files with missing lines	Coverage Δ
lamindb/models/schema.py	93.91% <92.00%> (-0.17%)	⬇️

... and 15 files with indirect coverage changes

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