add PredictKube Scaler docs

[daniel-yavorovich]

This PR adds documentation for a new PredictKube Scaler.

Checklist

• Commits are signed with Developer Certificate of Origin (DCO)

Relates to kedacore/keda#2418 & kedacore/keda#2458

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[tomkerkhove]

It looks like PredictKube is a service people need an API key for. I think it would be good if:

1. There is an introduction added before Trigger Specification clarifying that PredictKube is a service
2. Provide transparency on the data usage that is being sent to PredictKube. This can be as simple as adding a link to a privacy/legal page on your official docs but it should provide transparency if customer metrics are used to train the model as well

Thank you!

[daniel-yavorovich]

It looks like PredictKube is a service people need an API key for. I think it would be good if:

1. There is an introduction added before Trigger Specification clarifying that PredictKube is a service
2. Provide transparency on the data usage that is being sent to PredictKube. This can be as simple as adding a link to a privacy/legal page on your official docs but it should provide transparency if customer metrics are used to train the model as well

Thank you!

Thanks for this important point, Tom! We're currently working on our full policy to publish it in the nearest future.

[tomkerkhove]

Thank you! But I'd say this is a mandatory thing to have before we can merge this feature as it is pretty important for end-users to understand.

[tomkerkhove]

LGTM, but waiting for feature to be merged.

[zroubalik]

@daniel-yavorovich looking good, could you please properly rebase this PR, so it contains only PredictKube related commits? Then we are good to go

[daniel-yavorovich]

looking good, could you please properly rebase this PR, so it contains only PredictKube related commits? Then we are good to go

done, thank you

[zroubalik]

looking good, could you please properly rebase this PR, so it contains only PredictKube related commits? Then we are good to go

done, thank you

@daniel-yavorovich I can see 32 commits in this PR and majority of them non related to this PR

[daniel-yavorovich]

looking good, could you please properly rebase this PR, so it contains only PredictKube related commits? Then we are good to go

done, thank you

@daniel-yavorovich I can see 32 commits in this PR and majority of them non related to this PR

everything should be fine now