clan-config: improve jsonschema arg parsing

- output json to stdout after success
- expect args in the style: `foo.bar = baz`
- handle different input types
- cast input types on best effort basis
- throw meaningful errors

pkgs/clan-cli/pyproject.toml

@@ -27,7 +27,11 @@ disallow_untyped_defs = true
 no_implicit_optional = true
 
 [[tool.mypy.overrides]]
-module = "setuptools.*"
+module = "argcomplete.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "jsonschema.*"
 ignore_missing_imports = true
 
 [[tool.mypy.overrides]]
@@ -35,7 +39,7 @@ module = "pytest.*"
 ignore_missing_imports = true
 
 [[tool.mypy.overrides]]
-module = "argcomplete.*"
+module = "setuptools.*"
 ignore_missing_imports = true
 
 [tool.ruff]