Use importlib.metadata to get package version

[garryod]

Simplify getting version data with use of importlib.metadata, removes the dev requirement of setuptools_scm

[codecov[bot]]

Codecov Report

Merging #81 (a08124f) into main (a08124f) will not change coverage. The diff coverage is n/a.

:exclamation: Current head a08124f differs from pull request most recent head 735c704. Consider uploading reports for the commit 735c704 to get more accurate results

@@            Coverage Diff            @@
##              main       #81   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines           16        16           
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  Hits            16        16           

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