Add adoption type to recommendation

[qmhu]

Provide a way to let recommendation take effect.

• when set to AdoptionTypeStatus, recommendation value only present on recommendation.status.recommendationValue
• when set to AdoptionTypeStatusAndAnnotation, recommendation value only present on recommendation.status.recommendationValue and target object's annotation
• when set to AdoptionTypeAuto, recommendation value not only in status and annotation, it will apply to target's spec. If recommendation is Once , the value will apply to object once, if it is Periodical, the value will apply to object in every turn.

[mfanjie]

the value will apply to object once, if it is Periodical, the value will apply to object in every turn.
what's the different of this behavior from vpa?

[kitianFresh]

We should implement a remote apply provider so that crane is compatible with some crd operator, if the workload is controlled by a crd operator, we can not apply the workload directly.

[qmhu]

We should implement a remote apply provider so that crane is compatible with some crd operator, if the workload is controlled by a crd operator, we can not apply the workload directly.

If adoptionType != Auto, then user can apply it by themselves.

[qmhu]

the value will apply to object once, if it is Periodical, the value will apply to object in every turn. what's the different of this behavior from vpa?

Adoption defines the behavior for recommendation. It only care how to apply recommendation value to workload or just present it on recommendation.status or annotation, so if you create a recommendation for vpa and set adoptionType to Auto, then it will apply recommendation value to vpa based on CompletionStrategy.

Consider we recommend vpa's scalingStrategy and CompletionStrategy is Periodical, then recommendation will recommend scalingStrategy according to algo continuously.

[mfanjie]

/lgtm

[yufeiyu]

/lgtm