Rename livekit_server to livekit_api (#24984)

The name `livekit_server` was a bit misleading as it is not a server and
gets built into both the client and server - the server code is in
`collab`.

Release Notes:

- N/A

crates/livekit_client/Cargo.toml

@@ -28,7 +28,7 @@ cpal = "0.15"
 futures.workspace = true
 gpui.workspace = true
 http_2 = { package = "http", version = "0.2.1" }
-livekit_server.workspace = true
+livekit_api.workspace = true
 log.workspace = true
 media.workspace = true
 nanoid = { workspace = true, optional = true }