[TVMScript] Add __name__ attr for parsed PrimFunc and IRModule

[Hzfengsy]

This PR adds __name__ attr to indicate the func/mod name for parsed PrimFunc and IRModule.

cc @tqchen @cyx-6

[tvm-bot]

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• cc @junrushao, @shingjan _{See #10317 for details}

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[junrushao]

LGTM! Curious question: is the python-side attr going to affect the AST at all?

[Hzfengsy]

It will not affect the AST, just for a hint only in Python env for better UX :)