Make the ColumnSynthesizer follow the sdtypes in the metadata (not the data's dtypes)

[fealho]

CU-85zt7j8em, Resolve #249.

[sdv-team]

Task linked: CU-85zt7j8em SDGym - The ColumnSynthesizer should follow the sdtypes in the metadata (not the data's dtypes) #249

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.74%. Comparing base (241719b) to head (aa50092).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sdgym/synthesizers/column.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
+ Coverage   65.36%   65.74%   +0.37%     
==========================================
  Files          20       20              
  Lines        1282     1299      +17     
==========================================
+ Hits          838      854      +16     
- Misses        444      445       +1     

Flag	Coverage Δ
integration	53.88% <82.35%> (+0.37%)	⬆️
unit	52.88% <82.35%> (+0.39%)	⬆️

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[lajohn4747]

Have one comment about this PR, also are there failing test checks a problem?

[R-Palazzo]

Looks good!
Just let a comment about handling the new Metadata object