added pause_mining and resume_mining to all miners, added get_errors to whatsminers, and improved get_errors type hinting

pyasic/miners/avalonminer/cgminer/A7X/A7X.py

@@ -51,6 +51,12 @@ class CGMinerA7X(CGMiner):
             return True
         return False
 
+    async def stop_mining(self) -> bool:
+        return False
+
+    async def resume_mining(self) -> bool:
+        return False
+
     async def send_config(self, config: MinerConfig, user_suffix: str = None) -> None:
         """Configures miner with yaml config."""
         raise NotImplementedError