Add settings intent dialog

Add a dialog that can be launched via
an intent to prompt the user to enable
the provider for credman.

Test: make & atest & manual
Bug: 267816998
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9d74509888b7dd65b287bc68b9445d9e23809cce)
Merged-In: Id88cc7b3bf2829d075fbba87ea5dc0a245b9ae32

Change-Id: Id88cc7b3bf2829d075fbba87ea5dc0a245b9ae32