Improve typing of pipeline helper function

[xenova]

A first attempt at improving the types inferred when creating a new pipeline.

Still to do: return actual call parameters instead of (...args: any[]) => any.

Closes #484.

[HuggingFaceDocBuilderDev]

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[xenova]

After a bit of tinkering, I think I've got a good solution, which I've tested with the image segmentation pipeline, since this was requested by @wesbos in the original issue.

This also means when you hover over the class name, you'll get example code to help you out.

[kungfooman]

Wow, very nice work! 💯 👍

[vickkhera]

This changed the interface of pipeline() which broke my typescript. It should have caused a bump in minor version number at least, not just the patch number. See #504

[xenova]

Hi there. This was fixed in a subsequent version (2.13.3), could you please upgrade and try again?

[vickkhera]

Hi there. This was fixed in a subsequent version (2.13.3), could you please upgrade and try again?

I updated to 2.13.4 when I noticed the breakage and just narrowed it down to 2.13.1 release.

Even with 2.13.4 I had to rewrite my TS code to work with these changes. They are good changes but they are breaking changes so should have caused a version bump rather than a patch level.

Specifically I had to change the type of the function returned by pipeline() and then the type returned by that generated function also changed for some but not all tasks.