feat: add support for RefSeq functional data (#299)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (db2cb67) 73.01% compared to head (9f9e632) 73.83%.

Files	Patch %	Lines
src/functional/cli/query.rs	91.01%	15 Missing ⚠️
src/functional/cli/import.rs	96.82%	4 Missing ⚠️
src/main.rs	0.00%	4 Missing ⚠️
src/freqs/cli/import/mod.rs	0.00%	3 Missing ⚠️
src/freqs/cli/import/reading.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
+ Coverage   73.01%   73.83%   +0.81%     
==========================================
  Files          69       71       +2     
  Lines        6941     7245     +304     
==========================================
+ Hits         5068     5349     +281     
- Misses       1873     1896      +23     

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