loadtest improvements + phoenix #860
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This commit adds the concept of "datacenter" to our xDS protocol. Unlike other resources, there's slightly different behaviour between proxies to relays and relays to agents. When agent queries for a datacenter from the agent, it returns its own QCMP port and ICAO location. The host then adds the address of remote agent to identify the datacenter. The proxy then queries for datacenters, it gets all of agents addresses, ports, and ICAO codes. This will be used with a future commit to measure the distance between proxies and agents.
This commit uses the previous commit of datacentre discovery with an implementation of Phoenix Network Coordinates[1], to build a decentralised network coordinate map of all the datacentres that the proxies know about, using that information, we expose a new HTTP server at the same QCMP port that a client can use to query what datacentres are the closest to the proxy. For identifying datacentres we use ICAO codes, this allows us to colnsildate multiple logical datacentres into a single location, for example if you have multiple zones allocated in the same physical datacentre, in order to reduce the amount of options a client has to pick from in that case they're consolidated under their ICAO code. This allows for clients to get their full latency to datacentres which allows operators to a allocate datacentres dynamically, and in the closest location available to players. [1]: https://www.researchgate.net/publication/221198962_Phoenix_Towards_an_Accurate_Practical_and_Decentralized_Network_Coordinate_System
Further improvements on getting the number of endpoints for each packet, this time the value is cached, this should save us some expensive Arc::drops from dashmap.
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