Retrieve class or static info from node instead of type #5261
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Fixes #5259
This partially undo changes made in https://github.com/python/mypy/pull/5224/files. It is more safe to retrieve class and static flags directly from nodes, since callable types have often definition not set (especially after de-serialization). Also being class or static method is not really a property of type itself, it is rather an "access flag" for a given name in symbol table (similar to how a variable can be settable).