adding RpcPayloadType enum

Author: xianshijing-lk

protobufs/livekit_models.proto

@@ -451,6 +451,11 @@ message ChatMessage {
   bool generated = 6; // true if the chat message has been generated by an agent from a participant's audio transcription
 }
 
+enum RpcPayloadType {
+  UNCOMPRESSED = 0;
+  GZIP = 1;
+}
+
 message RpcRequest {
   string id = 1;
   string method = 2;
@@ -459,6 +464,8 @@ message RpcRequest {
   uint32 version = 5;
   // Compressed payload data. When set, this field is used instead of `payload`.
   bytes compressed_payload = 6;
+  // Indicates the compression type used for compressed_payload.
+  RpcPayloadType payload_type = 7;
 }
 
 message RpcAck {
@@ -473,6 +480,8 @@ message RpcResponse {
     // Compressed payload data. When set, this field is used instead of `payload`.
     bytes compressed_payload = 4;
   }
+  // Indicates the compression type used for compressed_payload.
+  RpcPayloadType payload_type = 5;
 }
 
 message RpcError {