Add UseLockFreeBloomFilter feature

When enabled, PoissonAllocationSampler will look up addresses in a
bloom filter before checking the LockFreeHashSet.

Also adds stats for the bloom filter to verify that the false positive
rate doesn't get too high.

Bug: 383374205
Change-Id: I332f1946baefd4e803e0eaaf68dd0c15156c1743
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6163907
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Joe Mason <joenotcharles@google.com>
Cr-Commit-Position: refs/heads/main@{#1520403}