Refactor ansible-test config classes. (#26505)

* Move Config classes from executor.py to config.py.
* Move Environment and Test config to config.py.
* Move Coverage/CoverageReport Config to config.py.
* Clean up type hints.

test/runner/lib/sanity.py

@@ -38,6 +38,9 @@ from lib.executor import (
     install_command_requirements,
     SUPPORTED_PYTHON_VERSIONS,
     intercept_command,
+)
+
+from lib.config import (
     SanityConfig,
 )