refactor: rename a_load -> async_load

Co-authored-by: Sophia <41456914+i0bs@users.noreply.github.com>
Signed-off-by: LordOfPolls <dev@lordofpolls.com>

interactions/models/internal/extension.py

@@ -155,7 +155,7 @@ def load(self, *args, **kwargs):
         """Run on extension load"""
         ...
 
-    async def a_load(self, *args, **kwargs):
+    async def async_load(self, *args, **kwargs) -> Callable[[], ...]:
         """Run on extension load, if there is a valid event loop"""
         ...