feat(recommend): add "Looking Similar" model

[raed667]

Implement Recommend looking-similar model.

Beyond the model name, everything else should work exactly as other recommend models such as related products.

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[dhayab]

My guess regarding failing tests is that they are just really flaky. I looked into merged PRs and all their pipelines are retried a few time until they go green.

[shortcuts]

this looks great :) do you plan on adding it to the generated clients too?

[dhayab]

Looks good to me 👍.

Regarding the RC release, as this addition follows closely how other methods are defined, I think it can be released directly in a minor as part of the monorepo release process.

If you prefer having an RC/Beta release, you should not merge this branch, and we can instead perform a manual release (or perhaps there's another process owners can guide us through).

[raed667]

@shortcuts indeed we should this to the generated clients as well 👍

@dhayab No beta/RC needed, once merged this should probably be simply released under 4.19.0

[shortcuts]

@shortcuts indeed we should this to the generated clients as well 👍

cool! let me know if you need help contributing to the specs