naia-lite

This is a stripped down version of naia for use specifically with deterministic lockstep applications.

Major changes/improvements

• Code base reduced from ~39k lines of rust to ~11.8k (as of 2024-10-21)
• Removed bevy, hecs, and miniquad from naia core (no more naia changes necessary after new bevy/hecs/miniquad releases)
• Removed entity replication; Entity replication is a huge chunk of the naia implementation. Deterministic applications don't benefit from these features. (~14.5k LoC)
• Removed tick buffered messages; These tend to be tighly coupled to the application, and can be implmented on top of the other networking channels. This removes a large amount of special casing in naia, and can be implemented at the application level more robustly with a fraction of the code. (~2.5k LoC)
• Removed WASM
• Full support for client and server being in the same process
• Messages are actually recieved in order, which allows deterministic applications
• Split send and receive operations

Other improvements

• Various bug fixes
• Dramatically improved best case latency
  • Immediate batch send avoids waiting a full tick duration in several places
  • Best case RTT is now ~0-2ms (depending on application), instead of ~100ms
• Reduced wait time between initial heartbeats (removes ~2.5s durting connect)
• Removed a bunch of smaller items:
  • user rooms
  • command history
  • BigMap
  • and a lot more

To do (As of 2024-10-21)

• Fully expose server configuration
• Use a u32 IdPool for UserKey
• Fix data packets drop race condition on connect
• Fix building with UDP still depends on webrtc