[DTC] Create Consent Dialog in Device Trust Navigation Throttle

Invoke the Device Signals Consent Dialog in the Device Trust Navigation Throttle if conditions met.

This creates dialog trigger on URL navigation for targeted users, to give them a chance to agree/refuse to share device signals.

For more details, see DD: go/dt-consent-dd (with demo and UI screenshot)

Bug: b:277902095
Change-Id: I908cec2c1fccb42dff201aa40f7c02b3676217df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4543745


Reviewed-by: Sébastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Zonghan Xu <xzonghan@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1149315}