RED-174158: Add Redis Cluster API in docs

[sonya-spasova]

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[jit-ci]

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[github-actions]

Staging links:
https://redis.io/docs/staging/sonya-spasova-onboard-cluster-api-RED-174158/operate/rs/api/api-reference/

[paoloredis]

I imagine this was added mistakenly

[paoloredis]

Rest looks good!

[rrelledge]

Thanks, @sonya-spasova! This looks great so far. I have a couple of initial questions and requested changes.

Can you move this API reference location underneath the existing API reference directory (https://redis.io/docs/latest/operate/rs/references/rest-api/)?
Ideally, I would like to eventually remove https://redis.io/docs/latest/operate/rs/references/rest-api/requests/ and https://redis.io/docs/latest/operate/rs/references/rest-api/objects/ and redirect readers to the new API reference at https://redis.io/docs/latest/operate/rs/references/rest-api/api-reference instead of the current URL https://redis.io/docs/latest/operate/rs/api/api-reference/.

[rrelledge]

Is 3346 an internal API port? We've been using examples like https://localhost:9443/v1/users in our public docs.