add read_all method for text streams

Author: lukasIO

livekit-rtc/livekit/rtc/data_stream.py

@@ -95,6 +95,12 @@ async def __anext__(self) -> TextStreamUpdate:
     def info(self) -> TextStreamInfo:
         return self._info
 
+    async def read_all(self) -> str:
+        final_string = ""
+        async for update in self:
+            final_string = update.collected
+        return final_string
+
 
 @dataclass
 class FileStreamInfo(BaseStreamInfo):