[omnibox][ml] Update bookmark provider to send all suggestions

Traditionally, the autocomplete providers calculate relevance
scores and pass only the top N most relevant results to the
controller.  With ML scoring, the relevance scoring is handled
by the controller who now needs access to the complete
list of suggestion candidates.

This CL adds a flag to ACMatch to differentiate "extra" suggestions,
a method to ACProvider to resize matches or mark suggestions as
"extra", and updates bookmark provider to send all suggestions
when the ML Scoring flag is enabled.

Bug: 1405555

Change-Id: I639db5e85d7d8efa67c7083061626b29db06cecb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4204880
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Angela Yoeurng <yoangela@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1100066}