[Feature] Metadata Composite Keys

[pvk-developer]

Resolves #2778
Resolves #2823
Resolves #2825
Resolves #2826

[sdv-team]

This Pull Request is not linked to an issue. To ensure our community is able to accurately track resolved issues, please link any issue that will be closed by this PR!

[codecov]

Codecov Report

❌ Patch coverage is 96.47059% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.06%. Comparing base (ca752a1) to head (6df4364).

Files with missing lines	Patch %	Lines
sdv/multi_table/base.py	77.27%	5 Missing ⚠️
sdv/single_table/base.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2842      +/-   ##
==========================================
- Coverage   98.11%   98.06%   -0.05%     
==========================================
  Files          73       73              
  Lines        8177     8286     +109     
==========================================
+ Hits         8023     8126     +103     
- Misses        154      160       +6     

Flag	Coverage Δ
integration	75.65% <82.35%> (+0.07%)	⬆️
unit	97.07% <95.88%> (-0.05%)	⬇️

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