fix: generate attributes even their type is unknown

[Aclrian]

Closes #1188.

Summary of Changes

If the type of an attribute is unknown, they will be added to the API as well.

Testing Instructions

run the api command with a class that has an attribute with no type hints.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JSON	eslint-plugin-jsonc	2	0	0	20.16s
✅ JSON	jsonlint	2		0	0.81s
✅ JSON	prettier	2	0	0	13.63s
✅ JSON	v8r	2		0	1.78s
✅ PYTHON	bandit	3		0	0.59s
✅ PYTHON	black	3	0	0	1.55s
✅ PYTHON	flake8	3		0	0.55s
✅ PYTHON	isort	3	0	0	1.36s
✅ PYTHON	mypy	3		0	2.25s
✅ PYTHON	pylint	3		0	5.76s

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[github-actions]

🎉 This PR is included in version 1.86.1 🎉

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