Ouranosinc / xclim / 12261890650

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Employ a `src`-based layout for code base (#1971)

### What kind of change does this PR introduce?

* Adapts the code base to use a `src`-based layout (in lieu of a flat
code base layout)
* Added a stricter `yamllint` configuration (no changes made to existing
YAML files)
* Pins `pint` to >=0.24.4 in order to support Python3.13 (and evade
failures from `flexparser>=0.4`).

### Does this PR introduce a breaking change?

Yes. The code base has been modified such that existing interactive
(`--editable`) installations will need to be re-installed.

This change prevents developers from accidentally running tests or
importing `xclim` from the root directory. That's essentially the major
gain.

Otherwise, we can say that this brings `xclim` closer in line with the
other `Ouranosinc/cookiecutter-pypackage` template-based projects.

### Other information:


https://packaging.python.org/en/latest/discussions/src-layout-vs-flat-layout/

https://www.pyopensci.org/python-package-guide/package-structure-code/python-package-structure.html#the-src-layout-and-testing

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