support openapi v2 for compatibility lower kubernete versions

[huiwq1990]

What type of PR is this?

What this PR does / why we need it:

If we want to run clusterpedia in low kubernete version , the kubernete apiserver will output error logs.

E1109 11:09:21.665110       1 controller.go:116] loading OpenAPI spec for "v1beta1.clusterpedia.io" failed with: OpenAPI spec does not exist
I1109 11:09:21.665131       1 controller.go:129] OpenAPI AggregationController: action for item v1beta1.clusterpedia.io: Rate Limited Requeue.  

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[clusterpedia-bot]

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[Iceber]

Thanks @huiwq1990, this looks like a very meaningful pr, I'll verify it!

[Iceber]

LGTM, Thanks