Adding block numbers migration dialog

+ When the user attempts to block a number and they haven't migrated
to the framework blocking implementation, they should be shown a
dialog that asks them to migrate. This CL introduces the Dialog that
is shown and updates the Call log and Call details to open it.
+ As part one of the change, the Dialog is shown every time the user
attempts to block or unblock a number (when the feature is enabled).
A later CL will complete this migration step to ensure that the
dialog is only shown until migration is finished.

Bug: 26664600
Change-Id: Ia4c2d504f8d98679b90d232058eb5ee6ea9b38f1