build: switch from setuptools to hatchling

For reproducible builds and also so that you no longer need
`--config-settings editable_mode=compat` for pip install
to make it work with Pyright.

Neither of these concerns really affect osm-proposals since I am
not publishing the package on PyPI nor does it expose any library
but I have other packages where they do apply and to simplify maintenance
I want to use the same build backend for all of my projects.

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