CI: add type checking (#10997)

* Set up type checking with mypy.

* Make mypy pass.

* Use list() instead of sorted().

tests/unit/plugins/modules/test_xcc_redfish_command.py

@@ -436,7 +436,7 @@ class TestXCCRedfishCommand(unittest.TestCase):
                     with self.assertRaises(AnsibleFailJson) as result:
                         module.main()
 
-    def test_module_command_PostResource_fail_when_no_requestbody(self):
+    def test_module_command_PostResource_fail_when_no_requestbody_2(self):
         with set_module_args({
             'category': 'Raw',
             'command': 'PostResource',