Merge branch 'srothh/transport-class-hierarchy' into srothh/worker-class-hierarchy

ref(transport): Add flush_async to Transport ABC

Author: srothh

sentry_sdk/transport.py

@@ -107,6 +107,19 @@ def flush(
         """
         return None
 
+    async def flush_async(
+        self: Self,
+        timeout: float,
+        callback: Optional[Any] = None,
+    ) -> None:
+        """
+        Send out current events within `timeout` seconds. This method needs to be awaited for blocking behavior.
+
+        The default implementation is a no-op, since this method may only be relevant to some transports.
+        Subclasses should override this method if necessary.
+        """
+        return None
+
     def kill(self: Self) -> None:
         """
         Forcefully kills the transport.