Add marda-extractors support for PW and CP input files

[edan-bainglass]

Adding support to qe-tools to allow users of the MaRDA extractors system to parse PW and CP input files.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c0e3c51) 89.89% compared to head (14f5516) 89.77%.

Files	Patch %	Lines
src/qe_tools/extractors/__init__.py	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   89.89%   89.77%   -0.12%     
==========================================
  Files          10       11       +1     
  Lines         465      489      +24     
==========================================
+ Hits          418      439      +21     
- Misses         47       50       +3     

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[sphuber]

Thanks @edan-bainglass . Just a few minor comments

[sphuber]

Thanks @edan-bainglass