feat: add powerlimit to avalon nano (#302)

* feat: add powerlimit to avalon nano

add power limit to avalon nano

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

pyasic/miners/backends/avalonminer.py

@@ -104,6 +104,23 @@ class AvalonMiner(CGMiner):
             return True
         return False
 
+    async def set_power_limit(self, wattage: int) -> bool:
+        try:
+            if wattage < 3:
+                limit = wattage
+            elif wattage > 100:
+                limit = 2
+            elif wattage > 80:
+                limit = 1
+            else:
+                limit = 0
+            data = await self.rpc.ascset(0, "worklevel,set", 1)
+        except APIError:
+            return False
+        if data["STATUS"][0]["Msg"] == "ASC 0 set OK":
+            return True
+        return False
+
     async def reboot(self) -> bool:
         try:
             data = await self.rpc.restart()