Add secondary values for gnomAD v4

[Char-Al]

It would be beneficial to add secondary values of gnomAD v4.
This enhancement would provide more context and could improve variant analysis.

Currently, only gnomAD (v4) exome and genome primary values.
Adding secondary values would allow users to have a more comprehensive view of the data, making it easier to analyze.

Proposed Changes

1. Add combined values (Genome+Exome)
2. Add max AF population
3. Add number of homozygous

Back-end

It may be necessary to use gnomAD differently and to pre-process it.

Front-end

It may be necessary to adjust the front-end to display all this information as clearly as possible.