[pre-commit] fix typos and configure codespell

This chanage enabled codespell in precommit and
fixes the existing typos.

A followup commit will enable this in tox and ci.

Change-Id: I0a11bcd5a88247a48d3437525fc8a3cb3cdd4e58

watcher/tests/common/metal_helper/test_maas.py

@@ -38,7 +38,7 @@ class TestMaasNode(base.TestCase):
 
     def test_get_power_state(self):
         if not maas_enum:
-            self.skipTest("python-libmaas not intalled.")
+            self.skipTest("python-libmaas not installed.")
 
         self._wrapped_node.query_power_state.side_effect = (
             maas_enum.PowerState.ON,