Selection Menus: Allow option resubmission

[sandro628]

As I integrate selection menus into more facets of the bots I develop, I've noticed that their current behavior has become a hindrance for what I assume are relatively common use cases.

I propose that they send a select interaction even if the user has already selected the respective option (alternatively, send a "deselect" interaction instead).

An example use case is role selection or any other case where the options of a selection menu are treated as toggles.

Additionally, while the state of selection menus are local and temporary, they still persist enough where reselecting an option an hour later, for example, is a bit of a hassle— requiring the user to select a different option just to be able to go back and select the intended option.