add unstake_all to SubtensorApi.extrinsics

Author: Roman

bittensor/core/subtensor_api/extrinsics.py

@@ -29,4 +29,5 @@ def __init__(self, subtensor: Union["_Subtensor", "_AsyncSubtensor"]):
         self.transfer = subtensor.transfer
         self.transfer_stake = subtensor.transfer_stake
         self.unstake = subtensor.unstake
+        self.unstake_all = subtensor.unstake_all
         self.unstake_multiple = subtensor.unstake_multiple