Provide a user-configurable denylist for Autofill

[msfjarvis]

Is your feature request related to a problem? Please describe.
We currently have a very small list of packages that are never autofilled into. This is hard-coded and not particularly useful as-is.

Describe the solution you'd like
Allow users to extend this allowlist through a settings option to add any apps that intentionally misbehave with Autofill or just shouldn't be autofilled into.

Describe alternatives you've considered
Have users submit bugs for apps that should be excluded and then extend this list manually.

Additional context
The deleted accessibility autofill code contained an activity that listed all apps, so that part can possibly be re-used here.

[rounakdatta]

@msfjarvis can I start an attempt at implementing this feature?

[msfjarvis]

@msfjarvis can I start an attempt at implementing this feature?

Sure thing! Please start a new discussion if you need any help during the process.

[msfjarvis]

@rounakdatta do you need help with this?

[msfjarvis]

Unassigned since @rounakdatta hasn't responded in 20 days.