With the intent to migrate all usages of the RateStatistics and RateTracker to these two new classes and thus encourage strong types over raw ints
Bug: webrtc:13756
Change-Id: I6d98024e903e75c41b2929509f601bb32d15259d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/312460
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40451}
