Add TabDDPM to SDGym single table synthesizers

[sarahmish]

original implementation is https://github.com/yandex-research/tab-ddpm/tree/main/tab_ddpm

[codecov]

Codecov Report

❌ Patch coverage is 92.74311% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.89%. Comparing base (3b2afff) to head (431e053).

Files with missing lines	Patch %	Lines
sdgym/synthesizers/tabddpm.py	92.73%	50 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
+ Coverage   85.81%   86.89%   +1.08%     
==========================================
  Files          40       41       +1     
  Lines        3722     4411     +689     
==========================================
+ Hits         3194     3833     +639     
- Misses        528      578      +50     

Flag	Coverage Δ
integration	51.68% <92.30%> (+7.51%)	⬆️
unit	83.24% <92.16%> (+1.65%)	⬆️

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[R-Palazzo]

This is looking good!

Do we expect this PR to support running TabDDPMSynthesizer in the single-table benchmark, including running it on AWS and GCP?

If so, could we add integration tests for benchmark_single_table()?

For AWS and GCP, I previously tested this manually and shared the result folder in the PR. For example, for #549, this is the test folder

I can help for testing it on AWS and GCP