TypeScript SDK: Remove use of `?connection_id` query param to `subscribe` HTTP route

[gefjon]

Currently, the SDK generates its ConnectionId locally, and passes it to the subscribe HTTP route. This is wrong; the server should (and would, given the opportunity) generate a unique ConnectionId for the connection and return it to the client. Rework the TypeScript client SDK to that effect.

DoD: When running a TypeScript client, the host logs do not contain any lines like:

2025-02-19T15:53:04.862398Z DEBUG /home/phoebe/clockworklabs/SpacetimeDB/crates/client-api/src/routes/subscribe.rs:74: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.    

[manchuwook]

Example chat server code for typescript doesn't work when you set the spacetimedb port to something other than 3000 (13000 in my case because I already have stuff that runs by default on 3000). Gives a 404 and the client can't connect.

spacetimedb-standalone version: 1.1.1

spacetimedb-standalone path: /opt/spacetime/spacetimedb-standalone

database running in data directory /home/spacetime/.local/share/spacetime/data

warning: some trace filter directives would enable traces that are disabled statically

note: `spacetimedb=debug` would enable the DEBUG level for the `spacetimedb` target

note: `spacetimedb_client_api=debug` would enable the DEBUG level for the `spacetimedb_client_api` target

note: `spacetimedb_lib=debug` would enable the DEBUG level for the `spacetimedb_lib` target

note: `spacetimedb_standalone=debug` would enable the DEBUG level for the `spacetimedb_standalone` target

note: `spacetimedb_commitlog=info` would enable the INFO level for the `spacetimedb_commitlog` target

note: `spacetimedb_durability=info` would enable the INFO level for the `spacetimedb_durability` target

note: `axum::rejection=trace` would enable the TRACE level for the `axum::rejection` target

note: the static max level is `off`

help: to enable logging, remove the `max_level_off` feature from the `tracing` crate

2025-05-15T02:35:53.546292Z DEBUG /usr/src/app/crates/standalone/src/subcommands/start.rs:148: Starting SpacetimeDB listening on 0.0.0.0:13000    

2025-05-15T02:38:06.307293Z DEBUG /usr/src/app/crates/client-api/src/routes/subscribe.rs:78: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.    

2025-05-15T02:38:06.325594Z DEBUG /usr/src/app/crates/client-api/src/routes/subscribe.rs:78: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.    

2025-05-15T02:42:40.904901Z DEBUG /usr/src/app/crates/client-api/src/routes/subscribe.rs:78: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.    

2025-05-15T02:42:40.930455Z DEBUG /usr/src/app/crates/client-api/src/routes/subscribe.rs:78: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.    

2025-05-15T02:43:07.972909Z DEBUG /usr/src/app/crates/client-api/src/routes/subscribe.rs:78: The connection_id query parameter to the subscribe HTTP endpoint is internal and will be removed in a future version of SpacetimeDB.