Lmoments3

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- Use a `src`-based library structure.
- Many internal improvements to the codebase:
* Migrated more configurations to the `pyproject.toml` file.
* Use dependency groups to reduce the number of PRs opened for dependabot.
* Add caching and cache-cleaning for test builds on GitHub Actions.
* Use commit hashes for all CI dependencies and Actions.
* Use `ruff` for coding standards, replace `isort` with `ruff`
* Replace `versioneer` with `setuptools-scm` for version tracking.
* Add `codespell` and `pygrep-hooks` to pre-commit configuration.

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- Fix algorithm convergence for the `kappa` distribution.
- Added Python 3.12 to the test suite and supported versions.
- Avoid inplace modifications of input arrays in ``lmom_ratios``.
- Adjusted the base dependency pins for the development environment.

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- Adopted `pyproject.toml` with `setuptools` backend for build configuration (PEP 517 and PEP 621)
- Various coding style standard improvements
- Added GutHub Workflows for automated deployment to PyPI

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- Rename `frechet_r_gen` to `weibull_min_r`, `frechet_r` being deprecated with SciPy 1.6
- Migrated organisations from OpenHydrology to Ouranosinc:
* Added Continuous Integration checks, pre-commit configurations, package metadata adjustments
* Code style now follows Black v2023.1
* ReadTheDocs documentation for lmoments3 no longer nested within OpenHydrology
* Documentation is now structured across pages
- Updated versioneer to v0.28

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- rename `frechet_r_gen` to `weibull_min_r`, `frechet_r` being deprecated with SciPy 1.6

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- Test on Python 3.5
- Simplify doc config