Add CLI command for mappings and improve biotype filtering

[maltekuehl]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 74.75728% with 26 lines in your changes missing coverage. Please review.

Project coverage is 89.76%. Comparing base (ad87223) to head (c6f4bdc).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
pytximport/utils/_filter_by_biotype.py	69.76%	13 Missing ⚠️
pytximport/_cli.py	57.14%	12 Missing ⚠️
pytximport/core/_tximport.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   92.48%   89.76%   -2.72%     
==========================================
  Files          24       24              
  Lines         665      733      +68     
==========================================
+ Hits          615      658      +43     
- Misses         50       75      +25     

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