feat: allow importing gnomAD SV/CNV v4 as background db (#295)

[holtgrewe]

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[codecov]

Codecov Report

Attention: Patch coverage is 87.87879% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 81.00%. Comparing base (43413d4) to head (61ab476).

❗ Current head 61ab476 differs from pull request most recent head 6dba78b. Consider uploading reports for the commit 6dba78b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   80.99%   81.00%           
=======================================
  Files          44       44           
  Lines        6010     6034   +24     
=======================================
+ Hits         4868     4888   +20     
- Misses       1142     1146    +4     

Files	Coverage Δ
src/strucvars/txt_to_bin/cli.rs	100.00% <100.00%> (ø)
src/strucvars/txt_to_bin/vardbs/input.rs	82.35% <0.00%> (-1.65%)	⬇️
src/strucvars/txt_to_bin/vardbs/mod.rs	89.47% <92.85%> (+0.18%)	⬆️