Introduce History.DomainCount*_V3 metrics

The existing "_V2" metrics include foreign/synced visits, which was not
intentional. This CL introduces a new set of "_V3" metrics that
properly filter out foreign visits.
Note that there are two slightly different kinds of foreign visits:
- "Legacy"-style visits, coming from TYPED_URLS. These are identified
  by SOURCE_SYNCED.
- "New"-style visits, coming from HISTORY. These are identified by a
  non-empty originator_visit_id, and also by SOURCE_SYNCED.
This CL filters out visits by both conditions, even though only
checking for SOURCE_SYNCED would technically be sufficient. The
reasons are:
a) `visit_source` is barely used otherwise, and might get removed at
   some point in the future.
b) Once `kSyncEnableHistoryDataType` is fully rolled out, the check
   for `visit_source` will become unnecessary (and checking the
   `originator_cache_guid` is simpler; no need to access the separate
   visit_source table).

The existing "_V2" metrics are *not* deprecated yet - it's useful to
keep them for a while, for ease of analysis and comparing with the new
ones.

Bug: 1422210
Change-Id: I12cabf24049f63b05c80ec8745dd8f4442bde271
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4315807
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1115601}