Add Python 3.13 support

[sirjobzy-mp]

🚀 Notes for Reviewers

This PR adds full Python 3.13 support and updates the minimum Python version to 3.10+.

Key changes:

• Removes deprecated imp module (removed in Python 3.12)
• Updates Falcon to support 4.x (required for Python 3.13)
• Fixes Falcon error handler signatures for 4.x/5.0 compatibility
• Adds beta branch publishing support to CI

🔗 Asana Tasks

https://app.asana.com/1/1510887156471/project/1204628953228187/task/1212639519845289?focus=true

🧪 Extended Description

Breaking Changes

• Minimum Python version is now 3.10 (previously supported 3.9)
• Falcon version constraint updated to >=3.0.0,<5.0.0

Changes by File

File	Change	Reason
setup.py	Replace imp.load_source() with regex	imp module removed in Python 3.12
setup.py	Add python_requires='>=3.10'	Declare minimum version
setup.py	Update falcon to >=3.0.0,<5.0.0	Falcon 3.x doesn't build on Python 3.13
requirements.txt	Update falcon constraint	Match setup.py
connector.py	Remove Python 2 urlparse fallback	Cleanup (Python 2 no longer supported)
restserver.py	Use req.bounded_stream.read()	WSGI compliance for Python 3.13
restserver.py	Fix error handler signatures	Falcon 4.x requires (req, resp, ex, params)
test.py	Change resp.body to resp.text	Falcon 4.x compatibility
publish.yml	Add test matrix for 3.10-3.13	Test across all supported versions
publish.yml	Support beta/** branches	Enable beta releases from branches

CI/CD Updates

• Tests now run on Python 3.10, 3.11, 3.12, and 3.13
• Beta releases can be triggered by pushing to beta/** branches
• Version validation ensures beta branches have pre-release version suffix

Testing

All tests pass on Python 3.13:

9 passed, 6 skipped (MySQL tests)

🤖 Generated with Claude Code