Skip checking for Faker function if its a default sdtype

[pvk-developer]

As part of #1407

[codecov-commenter]

Codecov Report

Patch coverage: 96.20% and project coverage change: -0.05 ⚠️

Comparison is base (898850a) 96.54% compared to head (4f2e695) 96.49%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1410      +/-   ##
==========================================
- Coverage   96.54%   96.49%   -0.05%     
==========================================
  Files          48       48              
  Lines        3730     3770      +40     
==========================================
+ Hits         3601     3638      +37     
- Misses        129      132       +3     

Impacted Files	Coverage Δ
sdv/constraints/tabular.py	98.89% <83.33%> (-0.36%)	⬇️
sdv/multi_table/base.py	98.45% <83.33%> (-0.50%)	⬇️
sdv/constraints/utils.py	100.00% <100.00%> (ø)
sdv/metadata/anonymization.py	100.00% <100.00%> (ø)
sdv/metadata/single_table.py	98.84% <100.00%> (+<0.01%)	⬆️
sdv/multi_table/hma.py	81.85% <100.00%> (ø)

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[amontanez24]