CI: add type checking (#10997)

* Set up type checking with mypy.

* Make mypy pass.

* Use list() instead of sorted().

plugins/module_utils/cmd_runner_fmt.py

@@ -4,10 +4,17 @@
 
 from __future__ import annotations
 
+import typing as t
+
 from functools import wraps
 
 from ansible.module_utils.common.collections import is_sequence
 
+if t.TYPE_CHECKING:
+    from collections.abc import Callable
+
+    ArgFormatType = Callable[[t.Any], list[str]]
+
 
 def _ensure_list(value):
     return list(value) if is_sequence(value) else [value]