User feedback submission functionality directly in Mathesar UI

[zackkrida]

Problem

Mathesar should have a mechanism for users to easily and directly submit feedback for improvements and suggestions for Mathesar.

Proposed solution

Something like the basic UI in Supabase, for example, would be ideal, with a button and simple form in the header:

We could, in theory, have additional functionality here, for example an email address input or other method of making sure users can be responded to. We could also ask users about use cases or potential other user research questions.

Finally, any functionality like this would need to be able to be easily configured and disabled by Mathesar installers who don't want their users to be able to do this.

Additional context