Clean-python

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- Add HTTP Bearer to OpenAPI security schema.

- Import debugpy at module level on setup_debugger import. Don't check for DEBUG
environment variable when setting up.

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- Pydantic 2.x support. Drops Pydantic 1.x support, use 0.1.x for Pydantic 1.x.
See https://docs.pydantic.dev/latest/migration/

- `BadRequest` is a subclass of `Exception` instead of `ValidationError` / `ValueError`.

- `oauth2.OAuth2Settings` is split into two new objects: `TokenVerifierSettings` and
`OAuth2SPAClientSettings`. The associated call signature of `Service` was changed.

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- Added py.typed marker.

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- Various import fixes.

- Avoid inject==5.* because of its incompatibility with VS Code (pylance / pyright).

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- Initial project structure created with cookiecutter and
[cookiecutter-python-template](https://github.com/nens/cookiecutter-python-template).

- Ported base functions from internal raster-service project.