[Feature] Composite Keys

[pvk-developer]

Resolves #835
Resolves #836
Resolves #837
Resolves #838
Resolves #839

[codecov]

Codecov Report

❌ Patch coverage is 98.57143% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.74%. Comparing base (7b5c44d) to head (1df944c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../reports/single_table/_properties/data_validity.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #863      +/-   ##
==========================================
+ Coverage   95.72%   95.74%   +0.01%     
==========================================
  Files         117      117              
  Lines        4914     4955      +41     
==========================================
+ Hits         4704     4744      +40     
- Misses        210      211       +1     

Flag	Coverage Δ
integration	81.21% <92.85%> (+0.23%)	⬆️
unit	84.46% <94.28%> (+0.04%)	⬆️

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