feat(server): add GET_PLAYER_PEER_STATISTICS to get useful peer stats

[AvarianKnight]

This adds the ability to get packet loss, packet loss variance, and round trip time variance, rtt is already revealed via GET_PLAYER_PING but this still re-adds it for consistency

Having some Prometheus endpoints here might make sense in the future, not sure if adding more endpoints is wanted outside of perf specific stuff though.

This PR applies to the following area(s)

Server

Successfully tested on

Platforms: Windows

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

[tabarra]

Cool PR, but why not return everything instead of single items per native call?

[AvarianKnight]

Cool PR, but why not return everything instead of single items per native call?

It could be done this way, I'm not sure what the overhead would be for this vs just a regular native call, it might make sense to have a native for each.