Add Binomial Regression Tests and Example Notebook

[ismailsenoz]

This PR adds testing and documentation for binomial regression functionality in RxInfer:

• Add test suite for binomial regression including:

  • Synthetic data generation
  • Model specification with BinomialPolya factor node
  • Inference validation with coverage tests

• Add Jupyter notebook example demonstrating:

  • Theoretical background of Bayesian binomial regression
  • Implementation using RxInfer
  • Visualization of posterior estimates
  • References to key papers (Polya-Gamma augmentation)

The tests verify proper convergence through free energy checks and parameter coverage analysis. The example notebook serves as both documentation and tutorial for users implementing binomial regression models.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.70%. Comparing base (f771180) to head (2891509).
Report is 10 commits behind head on main.

Additional details and impacted files

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