feat: explicit exports

[flying-sheep]

Also get rid of the __version__ attribute, I really want to discourage people from using that over importlib.metadata.version. Versions are properties of distributions (PyPI packages), not import packages, and there is a canonical way in the stdlib to retrieve them using the distribution name. This is often the same, but doing things right makes things way less confusing when it isn’t the same.

Also regarding __version_tuple__: If people want a structured version, they can depend on packaging and parse the version using packaging.version.Version. It’s extremely fast and all our packages import packaging anyway at import time.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.47%. Comparing base (a77c3d6) to head (17bb3b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   97.43%   97.47%   +0.04%     
==========================================
  Files           3        3              
  Lines         117      119       +2     
==========================================
+ Hits          114      116       +2     
  Misses          3        3              

Files with missing lines	Coverage Δ
src/scverse_misc/__init__.py	100.00% <100.00%> (ø)
src/scverse_misc/_deprecated.py	100.00% <100.00%> (ø)
src/scverse_misc/_extensions.py	96.34% <100.00%> (+0.04%)	⬆️

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