record TrialNames group by stages in ExperimentStatus

[sperlingxx]

What this PR does / why we need it:
In this PR, several list fields are added to record TrialNames in different stages owned by current Experiment, which facilitates trials tracking. Count fields are removed since trial counts of each stage can be figured out by the length of TrialNames.

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This change is 

[k8s-ci-robot]

Hi @sperlingxx. Thanks for your PR.

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[gaocegege]

Thanks for the PR. Not sure if we should do it, personally. Prefer to keep v1alpha3 API stable. I think we can add these new fields and keep the existing fields too.

WDYT @johnugeorge @hougangliu @richardsliu

[gaocegege]

/ok-to-test

@sperlingxx BTW, could you please add your infomation to https://github.com/kubeflow/katib/blob/master/docs/community/adopters.md if you are evaluating katib? Thanks

[sperlingxx]

/ok-to-test

@sperlingxx BTW, could you please add your infomation to https://github.com/kubeflow/katib/blob/master/docs/community/adopters.md if you are evaluating katib? Thanks

It's done, please check this PR.

[sperlingxx]

Thanks for the PR. Not sure if we should do it, personally. Perfer to keep v1alpha3 API stable. I think we can add these new fields and keep the existing fields too.

WDYT @johnugeorge @hougangliu @richardsliu

I also agree to keep v1alpha3 API stable, and I will restore count fields.

[johnugeorge]

Should we wait and move this to next api version(possible beta) bundled with other changes?

Related #906

[gaocegege]

@johnugeorge I think we can merge it since it does not break v1alpha3 API.

If we have a breaking change in API, we should discuss it before we implement it in the new API.

WDYT @hougangliu @sperlingxx @johnugeorge

[hougangliu]

@johnugeorge I think we can merge it since it does not break v1alpha3 API.

If we have a breaking change in API, we should discuss it before we implement it in the new API.

WDYT @hougangliu @sperlingxx @johnugeorge

SGTM

[johnugeorge]

/lgtm

[hougangliu]

/approve
thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hougangliu

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[johnugeorge]

/retest

[andreyvelich]

Should it be sts.FailedTrialList instead of sts.KilledTrialList ?

[sperlingxx]

@andreyvelich Yes, I've already fixed it.

[andreyvelich]

Thanks.
/lgtm