RPC types (#814)

* protobuf

* generated protobuf

* Changes

* generated protobuf

* clean up sids

* generated protobuf

* get rid of response acks

* generated protobuf

* rmer

* generated protobuf

* updated

* generated protobuf

* Create flat-birds-walk.md

* ws

* request_id

* generated protobuf

* rich

* generated protobuf

* code

* generated protobuf

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Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

.changeset/flat-birds-walk.md

@@ -0,0 +1,5 @@
+---
+"@livekit/protocol": minor
+---
+
+Add RPC types