[Relax] Add test case for op attributes in AST printer

[guan404ming]

Why

Resolve todo in tests/python/relax/test_ast_printer.py

How

• Added a new test function test_op_attrs in tests/python/relax/test_ast_printer.py.
• Removed the TODO comment.

[gemini-code-assist]

Summary of Changes

Hello @guan404ming, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new test case to the Relax AST printer to ensure that operation attributes are correctly represented when an AST node is converted to a string. This improves the robustness of the AST printer by validating its behavior with more complex node structures, specifically those involving custom attributes on operations.

Highlights

• New Test Case: A new test case, test_op_attrs, has been added to verify the AST printer's ability to correctly handle and print Op attributes.
• AST Printer Coverage: This change specifically enhances the test coverage for the AST printer in the Relax framework, ensuring proper serialization of operation attributes.
• TODO Resolution: A previously existing TODO comment in tests/python/relax/test_ast_printer.py, which requested the addition of a test case for op attrs, has been resolved and removed.

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[gemini-code-assist]

Code Review

This pull request successfully adds a test case for operator attributes in the AST printer, resolving a TODO. The implementation is correct and the test is valuable. I've provided one suggestion to refactor the attribute creation to use a more direct and idiomatic approach, which will make the code simpler and more readable.

[guan404ming]

cc @tlopex @mshr-h