Adapt methods of SeqVarPVS1Helper to new annonars pydantic models

[gromdimon]

Is your feature request related to a problem? Please describe.
We need more consistency in such methods as _lof_is_frequent_in_population and _lof_removes_more_then_10_percent_of_protein after we implement real annonars pydantic models.

Describe the solution you'd like
Migrate to new annonars models.
Correct the counting of pathogenic variants in _critical4protein_function
Correct the counting of LOF variants in _lof_is_frequent_in_population

Describe alternatives you've considered
N/A

Additional context
Good for implementation with #41

[gromdimon]

Should be implemented after #63

[gromdimon]

This methods were corrected in #63 since tests were failing otherwise. However, we have to increase code coverage for this methods