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Add suffixes_to_varaints.py to support migrating all histogram_suffixes
to new patterned histograms.

The script currently only handles the simplest case, i.e. Suffixes with
only one affected histogram to migrate to inline histograms.

Bug: 758782
Change-Id: I32905df5df5d00310c3029674a95d2705dab2f7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464207Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816853}