improve the class_utils to handle the duplicate class name case

[yhwen]

Fixes # .

Description

Improve the class_utils to handle the duplicate class name case. Provide clear message to show the multiple module names with the same class name.

Types of changes

• [x] Non-breaking change (fix or new feature that would not break existing functionality).
• [ ] Breaking change (fix or new feature that would cause existing functionality to change).
• [ ] New tests added to cover the changes.
• [ ] Quick tests passed locally by running ./runtest.sh.
• [ ] In-line docstrings updated.
• [ ] Documentation updated.

[chesterxgchen]

/build

[chesterxgchen]

/build