l7mp / stunner / 7133985139

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refactor: Re-implement CDS API over OpenAPI

Since the CDS service becomes critical for the push/pull of STUNner configs between different
components, gateway-operator, stunnerd, stunnerctl (TODO), and the auth-service (TODO), it has
become imperative to make the code reusable, extensible and thoroughly tested. This refactor
implements this change:
- create OpenAPI def for the STUNner dataplane API (see pkg/config/api)
- implement a general purpose CDS server
- add 3 APIs: ListV1Configs to get/watch for *all* configs in the cluster, ListV1ConfigsNamespace
to get/watch all configs in a given namespace, and GetV1ConfigNamespaceName to get/watch the config
of a specific gateway (namespace/name)
- implement a general purpose client to use all 3 APIs
- reimplement the CDS client/server over the new code
- add lots of tests

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