Have login page remember hosts

[jjsimps]

Is your feature request related to a problem? Please describe.
Sometimes I have to switch between nebula instances while using studio. I have to copy/paste the host every time since it's quite long.

Describe the solution you'd like
It would be nice if studio could remember the hosts/username combo. Ideally, it could remember multiple "profiles" that I could switch between when logging in so I don't have to copy/paste so much. Doesn't need to remember password, but could at least remember host/username combinations.

Describe alternatives you've considered
Auto-fill for browsers only works for username fields.

Thank you!

[wey-gu]

cc @slimshadylol0303