Add internal function to check binary matrix inputs

[karissawhiting]

Functions like summarize_by_gene(), susbet_by_frequency() and tbl_genomic() all require a binary matrix input. These all have internal checks but we should synthesize into one input checking function (maybe .check_gene_binary() or sanitize_gene_binary()).

This may apply to some plotting functions as well.

Consider making gene_binary() a class?