feature request: merge floating_window & floating_window_above_cur_line into an enum

[FelipeLema]

use floating_window to be one of the following:

• "off" never activate
• "above" activate above cursor
• "below" activate below cursor
• a function that returns one of the items above

my use case is that I don't want hover window to pop-up when I'm typing inside a comment. Something similar can be found for nvim-cmp

[FelipeLema]

I can work on this if maintainers are willing to accept such a feature