Add function to pass gene to see which IMPACT panels it is on

[karissawhiting]

Sometimes when checking missing data, it is helpful to see what panels certain genes are on. A helper function like:

which_impact("KMT2D")

that returns all IMPACT panels for that gene or its aliases would be useful. See alias resolution code and integrate here as well.

[karissawhiting]

• I would first check their gene for aliases and recode to common format (see/use recode_alias())
• Then i would check it against the internal data set of panels gnomeR::gene_panels

[karissawhiting]

Closed with #191