Add tool tips to Hide, Mute & Kick buttons in avatar toast (flat UI)

[DougReeder]

Is your feature request related to a problem? Please describe.
It's not obvious that the Hide button hides your avatar from the other user, and it expires with your session.

It's not obvious that the Mute button (moderators only) mutes the person for everyone.

Kicking a user has different implications when a room is linked via a Discord chatbot.

Describe the solution you'd like
Tooltips displayed when hovering the mouse over these controls.

Describe alternatives you've considered
The docs might also be expanded.

Additional context
Probably almost every control in the flat UI should have a tooltip.

[Exairnous]

For the record, kicking a user is the same regardless of whether the room is bound to Discord or not (it's just that when it's bound to Discord you can modify stuff on the Discord side to prevent them re-entering the room), and these docs seem to give pretty clear descriptions of the three actions specified: https://docs.hubsfoundation.org/hubs-features.html#avatar-menu

I'm not against adding more tooltips, though, but I think we need to be careful not to clutter the UI too much. Adding a delay to tooltips showing up should help with this, along with adding in preferences for showing tooltips (e.g., allow users to disable them separately for 3d menus and the 2d HUD). Settings like these don't necessarily have to be added before adding any more tooltips, but it would be good to do sooner rather than later, before we get too many new ones.

Another thing to keep in mind is that currently the 3d menus are objects in-world and so are rendered with perspective and distinct orientations, so it may look strange to have tooltips in the 2d (HUD) UI overlaid on top of that (also, the menus are handled very differently between the A-Frame and bitECS clients, so that would likely have to be accounted for).