add text message request and response (#1349)

* add text message request and response

* generated protobuf

* add changeset

* add terminate

* generated protobuf

* add session_id

* generated protobuf

* add UpdateSessionData

* generated protobuf

* add PushTextRequest

* generated protobuf

---------

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

Author: longcw

.changeset/five-baths-tie.md

@@ -0,0 +1,5 @@
+---
+"github.com/livekit/protocol": patch
+---
+
+Add TextMessageRequest and TextMessageResponse