Reduce overhead in the typescript sdk

[joshua-spacetime]

Description of Changes

1. Cache the connection-id hex prefix and reuse it when generating event IDs

Previously, the SDK rebuilt the connection-id string on every event. Now it computes the prefix once per connection-id update and reuses it.

2. Replace Promise-chained inbound message processing with a synchronous ordered drain loop

Now inbound messages are still processed through a direct drain loop instead of a promise chain to reduce scheduler overhead.

3. Cache encoded reducer/procedure names and use specialized CallReducer/CallProcedure writers

Previously, reducer/procedure calls always went through the generic ClientMessage object path and re-encoded the method name each time. Now the SDK caches UTF-8 encoded reducer/procedure names and uses direct CallReducer / CallProcedure writers on the hot path, while keeping the generic path as fallback.

API and ABI breaking changes

None

Expected complexity level and risk

2

Testing

Manual: 100K -> 130K TPS running keynote-2 benchmark on apple m2

MAX_INFLIGHT_PER_WORKER=512 pnpm run bench test-1 --seconds 10 --concurrency 50 --alpha 1.5 --connectors spacetimedb