CHORE: Add benchmark workflows with airspeed velocity (asv)

[xImoZA]

This PR adds performance benchmarks for the core, distributions, and estimators modules using Airspeed Velocity (asv) and includes several bug fixes and stability improvements.

Benchmarks:

• Module Coverage: Implemented benchmark suites for the following components:
  • core: Speed and memory tracking for MixtureModel methods.
  • distributions: Speed and memory tracking for distribution methods and Parameter descriptor overhead.
  • estimators: Speed and memory tracking for E-/M-steps and ECM fit method (analytical solution).

Fixes & Improvements:

• Numerical Stability: Prevented log(0) errors in E-/M-steps and integrated handle_numerical_overflow logic into the Pareto Q-function.
• Core Methods: Fixed behavior in MixtureModel .copy() and .astype() methods.
• Pipeline.fit: Fixed correct state update logic during pruning (sequential index updates).
• Documentation: Corrected docstrings for Beta, Cauchy and Uniform distributions.
• Docs Formatting: Fixed formatting syntax errors to restore correct Sphinx documentation generation.
• Testing: Added tests covering these fixes and numerical edge cases.

Documentation:

• Usage Guide: Added benchmarks/README.md providing instructions for environment setup, development runs, and regression testing.