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

Merge the class structure changes from transport

Author: srothh

sentry_sdk/transport.py

@@ -107,19 +107,6 @@ 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.