Feature request to show "germline biallelic" statistics in the portal

[cband]

Show "# germline homozygous" in gene and variant level pages.

• In the gene level page, show "# germline homozygous" column in the table between "% Prevalence" and "Cancer type" columns. This data is in the "n_germline_homozygous" column in 'signaldb_all_variants_frequencies.txt'.
• In the variant level page, show "# germline homozygous" column in the table between "# Carriers" and "% Prevalence" columns. This data is in the "n_germline_homozygous" column in 'signaldb_variants_by_cancertype_summary_statistics.txt'

In the variant level page, show "% germline homozygous" in the "cancer patient prevalence field. This data is in "signal.pancancer_somatic_germline_stats.txt" file. For example:

~~in https://www.signaldb.org/variant/1:g.45797228C%3ET cancer patient prevalence: Germline 0.8% (Biallelic: 18.4%, Germline homozygous: 0.02%)~~

Thank you.

[leexgh]

Move this ticket to signal repo: https://github.com/knowledgesystems/signal/issues/112