AST-based utility for checking ops registration and relative imports #729

We'd like an AST-based utility (for kernels-community) that statically checks kernel source for common correctness issues, in particular:

• Ops registration — verify that ops are correctly registered (e.g. names match, definitions are consistent).
• Relative imports — verify that Python files in torch-ext/ use correctly relativized imports.

Motivation / context

This came up while discussing how to make kernel conversion more deterministic. A lot of the conversion steps could be automated, e.g.:

• Fetch a kernel from a URL at a given tag (vx.y.z, or latest stable).
• Copy files from foo/bar/baz to torch-ext/bar/baz.
• Relativize paths in Python files in torch-ext/bar.
• Fix op definitions in Python files in torch-ext/hello.

The AST-based checker/utility could become a reusable component for that flow. There's an open question of whether the conversion tooling should be a full DSL or just a Python utility — this issue tracks the underlying AST-based utility itself, which is useful either way.

Related: #718

Requested by Sayak Paul - Slack thread - Agent trace