Fix DeprecationWarning on import, switch to hatchling build system

[brews]

This fixes the DeprecationWarning about the pkg_resources package when dscim is imported. The warning comes from the system used to get the package version into dscim.__version__. With this fix, the version info is written to src/dscim/_version.py whenever the package is built by hatchling, and src/dscim/__init__.py. does from dscim._version import __version__ and that's it.

This switches the build system from setuptools to hatchling. This is an internal change. Generally, people shouldn't notice this change. We prob would have switched build systems at some point anyways so might as well do it here.

Close #112

[codecov]

Codecov Report

Merging #128 (fc6f500) into main (edf4e1b) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head fc6f500 differs from pull request most recent head fbd2cbc. Consider uploading reports for the commit fbd2cbc to get more accurate results

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
+ Coverage   65.27%   65.29%   +0.01%     
==========================================
  Files          17       17              
  Lines        1846     1841       -5     
==========================================
- Hits         1205     1202       -3     
+ Misses        641      639       -2     

Files Changed	Coverage Δ
src/dscim/__init__.py	38.46% <ø> (-0.99%)	⬇️

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