Add position and execution.fast subscriptions for Bybit (#2104)

nautilus_trader/adapters/bybit/websocket/client.py

@@ -270,11 +270,15 @@ async def unsubscribe_klines(self, symbol: str, interval: str) -> None:
     ################################################################################
     # Private
     ################################################################################
-    # async def subscribe_account_position_update(self) -> None:
-    #     subscription = "position"
-    #     msg = {"op": "subscribe", "args": [subscription]}
-    #     await self._send(msg)
-    #     self._subscriptions.append(subscription)
+
+    async def subscribe_account_position_update(self) -> None:
+        subscription = "position"
+        if subscription in self._subscriptions:
+            return
+
+        self._subscriptions.append(subscription)
+        msg = {"op": "subscribe", "args": [subscription]}
+        await self._send(msg)
 
     async def subscribe_orders_update(self) -> None:
         subscription = "order"
@@ -294,6 +298,15 @@ async def subscribe_executions_update(self) -> None:
         msg = {"op": "subscribe", "args": [subscription]}
         await self._send(msg)
 
+    async def subscribe_executions_update_fast(self) -> None:
+        subscription = "execution.fast"
+        if subscription in self._subscriptions:
+            return
+
+        self._subscriptions.append(subscription)
+        msg = {"op": "subscribe", "args": [subscription]}
+        await self._send(msg)
+
     async def subscribe_wallet_update(self) -> None:
         subscription = "wallet"
         if subscription in self._subscriptions: