[feature] Save temporary data of suggestions to DB.

[YujiOshima]

Currently, suggestions store the intermediate information in their memory.
It makes the services stateful.
We should make DB interface for suggestion services.

[jlewi]

@YujiOshima @gaocegege Should we try to fix this in 0.3.0? How important and how hard is it?

[gaocegege]

I do not think it is in high priority, while it is not very hard, IMO.

WDYT @YujiOshima

[YujiOshima]

It's already supported in random, gird, and hyperband. @libbyandhelen how about BO?

[jlewi]

Are we going to try to fix this in 0.4.0? Should we open up specific issues to track this for specific algorithms?

[jlewi]

/label 0.4.0

[johnugeorge]

Suggestion is a CR in v1alpha3 which has algorithm settings in Status. This is the latest settings provided in the GetSuggestions response.

[johnugeorge]

Closing the issue as it is fixed in v1alpha3