Migration from setup.py to pyproject.toml

[martin-springer]

Modernizes the package build configuration by replacing setup.py, setup.cfg, versioneer.py, and MANIFEST.in with a single pyproject.toml file. Uses setuptools as the build backend and setuptools-scm for automatic version management from git tags (replacing versioneer). Updates rdtools/__init__.py to use importlib.metadata for version retrieval.

Changes

• Added pyproject.toml with all project metadata, dependencies, optional dependencies, URLs, pytest config, and package data
• Removed setup.py, setup.cfg, versioneer.py, MANIFEST.in, and rdtools/_version.py
• Updated rdtools/__init__.py to use importlib.metadata.version() instead of versioneer

Checklist

• Code changes are covered by tests
• Code changes have been evaluated for compatibility/integration with TrendAnalysis
• New functions added to __init__.py
• API.rst is up to date, along with other sphinx docs pages
• Example notebooks are rerun and differences in results scrutinized
• Updated changelog

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.69%. Comparing base (3c594db) to head (55b4a3a).

Files with missing lines	Patch %	Lines
rdtools/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #491      +/-   ##
===============================================
- Coverage        97.03%   96.69%   -0.34%     
===============================================
  Files               12       12              
  Lines             2329     2332       +3     
===============================================
- Hits              2260     2255       -5     
- Misses              69       77       +8     

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