feat: add parser library

[jterrace]

• clean up unused main
• drop support for python 3.9 since it is end of life
• implement a basic parser registry

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/onvif_parsers/__init__.py	100.00% <100.00%> (ø)
src/onvif_parsers/model.py	100.00% <100.00%> (ø)
src/onvif_parsers/registry.py	100.00% <100.00%> (ø)

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