media: Add a new mojo interface to query media foundation preferences

This CL adds a new mojo interface that handles media foundation
preferences queries.

Currently, we have a MediaFoundationServiceMonitor that is a singleton
in the browser. MediaFoundationServiceMonitor is used to query the local
state and makes provides an interface to make decision on whether or not
to fall back from a Hardware Secure Decyrption to Software Secure
Decyrption.

This CL add a mojo interface to facilitate access to fallback decision
from render frame (in future CLs).

Bug: 1296219
Change-Id: Ib5b5e8363ab6cac4c622986703f6ff2bc2244f13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4419933
Reviewed-by: Chris Bookholt <bookholt@chromium.org>
Commit-Queue: Feras Aldahlawi <feras@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1139894}