removing python build

[K20shores]

We found it better to put the python bindings directly into musica, since that's really the only package that will use it anyways. That is done in NCAR/musica#328

[Copilot]

Pull Request Overview

This PR removes the standalone Python build for mechanism_configuration in favor of integrating the Python bindings directly into musica. Key changes include:

• Removal of Python build configurations and targets from various CMakeLists.txt files.
• Deletion of Python-specific files (pyproject.toml, mechanism_configuration/init.py, mechanism_configuration/CMakeLists.txt) and related workflow configurations.
• Cleanup of dependency management by eliminating the pybind11 fetch block.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/CMakeLists.txt	Removed the condition for building Python bindings alongside PIC.
pyproject.toml	Entire file removed as Python build is no longer needed.
mechanism_configuration/init.py	Removed all Python binding entry points.
mechanism_configuration/CMakeLists.txt	Removed Python module build configuration.
cmake/dependencies.cmake	Deleted pybind11 dependency fetch block due to removal of Python.
README.md	Removed the PyPI badge to reflect the discontinued Python package.
CMakeLists.txt (top-level)	Removed Python build option and subdirectory addition; adjusted packaging logic.
.github/workflows/python.yml	Removed workflow for testing Python builds.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.95%. Comparing base (a612265) to head (2de0f56).
⚠️ Report is 99 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   86.95%   86.95%           
=======================================
  Files           3        3           
  Lines          23       23           
=======================================
  Hits           20       20           
  Misses          3        3           

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