Add application-level cluster failover strategy API

[XiShanYongYe-Chang]

What type of PR is this?

/kind api-change /kind feature

What this PR does / why we need it:

Add application-level cluster failover strategy API

Which issue(s) this PR fixes: Part of #6317

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please assign kevin-wangzefeng for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS
• pkg/apis/OWNERS

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[XiShanYongYe-Chang]

Can you help take a review. /cc @kevin-wangzefeng @RainbowMango