[AutofillAi] Update table to have use count and date used data

This is the final CL for implementation of frencency.

Bug: 408421018
Change-Id: If87ef5a97f74ba9ef1328d8eac500b346c702177
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6477428
Reviewed-by: Olivier Li <olivierli@chromium.org>
Auto-Submit: Bruno Braga <brunobraga@google.com>
Reviewed-by: Jan Keitel <jkeitel@google.com>
Reviewed-by: Etienne Bergeron <etienneb@chromium.org>
Commit-Queue: Jan Keitel <jkeitel@google.com>
Reviewed-by: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/main@{#1452184}