Introduce dialogs for credentials actions

[timja]

What feature do you want to see added?

Instead of individual pages for:

• Move
• Delete
• New credentials
• New domain
• Update credentials

Use dialogs for updating these.

I think this should be fairly straightforward using the form approach.
Might be a bit more complicated on the main credentials page where all the credentials are a list as we probably don't want to include a form for every single one on the page for performance reasons.

Upstream changes

Best done after #984 lands (or branched off from it)

Are you interested in contributing this feature?

Yes

[timja]

cc @janfaracik @mawinter69

[timja]

The delete one that has been created is currently taking you to the store after deletion rather than staying on the same page which isn't ideal