add proxy skeleton

[ikaven1024]

Signed-off-by: yingjinhui [email protected]

What type of PR is this? /kind api-change /kind feature

What this PR does / why we need it: Implement for proxy

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

users can request global resource by api: /apis/search.karmada.io/v1alpha1/search/proxy/...

e.g. list all the pods across clusters:
kubeclt get --raw /apis/search.karmada.io/v1alpha1/search/proxy/api/v1/pods

[ikaven1024]

@RainbowMango is the api is appropriate?

[RainbowMango]

cc @XiShanYongYe-Chang I'll look at it later.

[XiShanYongYe-Chang]

ok

[XiShanYongYe-Chang]

The release-note may need to be updated.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango, XiShanYongYe-Chang

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