Support hjkl in addition to arrow keys.

[yhakbar]

Describe the enhancement

Adding support for hjkl is a simple way to make catalog more convenient for users familiar with vim and lets users avoid leaving the home row.

• h --> left
• j --> down
• k --> up
• l --> right

Definitely not a priority now, but it should also be a very minor change. We just need to update the key bindings for navigation to add the additional keys. We should definitely avoid binding anything else to these keys to avoid incompatibility here.

RFC Not Needed

• I have evaluated the complexity of this enhancement, and I believe it does not require an RFC.