[iOS][MF] General and password actions metrics

Creates and logs user actions for the following actions.

ManualFallback_Close
ManualFallback_ClosePopover
ManualFallback_OpenPassword
ManualFallback_OpenCreditCard
ManualFallback_OpenProfile

ManualFallback_Password_SelectUsername
ManualFallback_Password_SelectPassword
ManualFallback_Password_OpenOtherPassword
ManualFallback_Password_OpenManagePassword

Bug: 845472, 881734
Change-Id: If251294575be60b9c27296e79e06a394a277762e
Reviewed-on: https://chromium-review.googlesource.com/c/1317914
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606408}
5 files changed