Reland "[bazel][mlir][python] Port #155741: stub auto-generation"

[Ahajha]

Relands #157173 (reverts #157995).

The stubgen was relanded here: #157930

[makslevental]

this one wasn't removed

[Ahajha]

Thanks, checking locally currently.

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[makslevental]

nor this one (nor the quant.pyi below).

[makslevental]

LGTM even though I don't actually know bazel 🤷

[Ahajha]

Thanks :) Double checking things are working for me locally

[Ahajha]

Okay I think things are good, I'll follow up if there are more to remove.

[Ahajha]

All that's left is the WORKSPACE, indifferent if this gets merged now (we don't use it), but someone else might want it.

[rupprecht]

All that's left is the WORKSPACE, indifferent if this gets merged now (we don't use it), but someone else might want it.

Same, I had bumped the version to 2.9.2 because I thought we might need it, but we don't. I think we might as well use the same version for consistency though.

[Ahajha]

@rupprecht would you mind merging? I don't have write access (I'll have to ask Chris for that at some point).