Add strucvar pvs1 decision tree

[gromdimon]

Issue:

• Closes Specify the Del - Dup PVS1 decision tree #37

Description:

• Add decision tree sceleton in strucvar_pvs1.py

[codecov]

Codecov Report

Attention: Patch coverage is 31.03448% with 60 lines in your changes are missing coverage. Please review.

Project coverage is 80.62%. Comparing base (834e329) to head (fd1be42).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   84.18%   80.62%   -3.56%     
==========================================
  Files          16       16              
  Lines        1081     1156      +75     
==========================================
+ Hits          910      932      +22     
- Misses        171      224      +53     

Files	Coverage Δ
src/seqvar_pvs1.py	57.87% <100.00%> (ø)
src/strucvar_pvs1.py	32.65% <28.57%> (-10.83%)	⬇️