[Feature Request] Add the matchID or another unique identifier to the replay

Hey,

this is not really a request for the s2protocol, but for the contents of a replay. Currently is quite hard to say determine that two or more replays are from the same match; all from a different match participant (player, observer, etc).
There is no matchID in it, the matchtime is based on the users PC, gameloops can differ depending on when a player leaves a match (especially for team matches), etc...
There must be a matchID somewhere in the Battlenet-universe for a match. Is it possible to include this in the replay or some other unique hash, to identify the match the replay belongs to?

Thanks and greetings,

Andy!

No file, test, or entry point is named in the issue, so begin by locating where replay contents are decoded and where match metadata could be represented. Done means replays from the same match can be identified reliably, with the behavior covered by an appropriate test or reproducible validation.

Written by the indexing model from the issue text.