Ability to benchmark / track metrics

[JTimNolan]

Need to decide KPIs that will be used for core development (type 1), for lance-based game development (type 2), and for tracking production deployment stats (type 3). Probably want a unified API for tracking / reporting these stats. Personally I think it makes sense to start with a focus on lance core development as it will be immediately useful. Some metrics already suggested in slack:

Core KPI / Type 1:

• Network usage
• Server tick speed w/o extrapolation (we will probably need to have one/several standardized configurations for this to work for core dev benchmarking, but I think it's still useful. If not this, we'll need another way to benchmark the speed/efficiency of the lance core and any connectors we build)

Type 2 metrics:

• FPS
• Client tick speed
• Server tick rate w/ extrapolation

Type 3 metrics:

• latency

Please share other metrics that would be useful and implementation suggestions.

[namel]

Would be great to have a pull request on this one, and in general any test suites that we can run.