make `tbl_genomic` an official 'gtsummary' table

[michaelcurry1123]

• [x] Do something about environments idk @michaelcurry1123 knows.
• [x] Maybe append a class? (Although maybe do this later
• [x] Remove all styling from internal function
• [x] Update examples and tests to use new example data (depends on #175 )
• [x] Review unit tests and make sure everything important is being tested
• [x] Maybe rewrite gene summary calculations (pre-thresholding) to be faster by using base R?
• [x] Work with whoever is working on the vignette to add a section about this
• [x] #197

[michaelcurry1123]

Dan said to make it an official 'gtsummary' table all you need to do is append your own class to the front of the class like so: class(df_tbl) <- c("tbl_genomic", class(df_tbl)). Then from here if we wanted to create a tbl_genomic method we can and the classes will be in the proper order. I can add it to the function tbl_genomic().

[michaelcurry1123]

might want to remove bold_labels and add_overall from internals of tbl_genomic and just allow the user to specify.

[karissawhiting]

@michaelcurry1123 can we close this?

[michaelcurry1123]

@karissawhiting yes we can close!