Refactor Hyperband Suggestion

[andreyvelich]

/kind feature

The Hyperband implementation in Katib has few problems: #1168, #690.
We should refactor it since we support Early Stopping.

Let's continue discussion in this issue.

/cc @gaocegege @johnugeorge @czheng94 @terrykong @asispatra
/priority p1

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[andreyvelich]

/lifecycle frozen
/help

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