Get version with importlib.metadata

[awdeorio]

Modernize how Madoop obtains its own version string for the --version flag implementation.

On some installs, we get an error

$ madoop  --version
Traceback (most recent call last):
  File "/opt/homebrew/bin/madoop", line 5, in <module>
    from madoop.__main__ import main
  File "/opt/homebrew/lib/python3.11/site-packages/madoop/__main__.py", line 12, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

It looks like pkg_resources is deprecated and is replaced by importlib.metadata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.32%. Comparing base (63a8f6e) to head (ff650bc).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #76      +/-   ##
===========================================
- Coverage    96.34%   96.32%   -0.02%     
===========================================
  Files            4        4              
  Lines          246      245       -1     
===========================================
- Hits           237      236       -1     
  Misses           9        9              

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