Add ability to store and load constraints from file

[frances-h]

Resolve #2891

[codecov]

Codecov Report

❌ Patch coverage is 97.34513% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.04%. Comparing base (3747330) to head (603a3ab).

Files with missing lines	Patch %	Lines
sdv/cag/programmable_constraint.py	94.11%	1 Missing ⚠️
sdv/multi_table/base.py	96.66%	1 Missing ⚠️
sdv/single_table/base.py	96.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2892    +/-   ##
========================================
  Coverage   98.04%   98.04%            
========================================
  Files          73       73            
  Lines        8343     8454   +111     
========================================
+ Hits         8180     8289   +109     
- Misses        163      165     +2     

Flag	Coverage Δ
integration	75.85% <71.68%> (+0.14%)	⬆️
unit	97.09% <92.92%> (+0.01%)	⬆️

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