Rewrite of AutoShardedClient to prevent overlapping identify

This is experimental and I'm unsure if it actually works

discord/state.py

@@ -1047,6 +1047,7 @@ class AutoShardedConnectionState(ConnectionState):
         super().__init__(*args, **kwargs)
         self._ready_task = None
         self.shard_ids = ()
+        self.shards_launched = asyncio.Event()
 
     async def chunker(self, guild_id, query='', limit=0, *, shard_id=None, nonce=None):
         ws = self._get_websocket(guild_id, shard_id=shard_id)
@@ -1073,6 +1074,7 @@ class AutoShardedConnectionState(ConnectionState):
                 log.info('Finished requesting guild member chunks for %d guilds.', len(guilds))
 
     async def _delay_ready(self):
+        await self.shards_launched.wait()
         launch = self._ready_state.launch
         while True:
             # this snippet of code is basically waiting 2 * shard_ids seconds