Ftr logging link alpha

[tylerreidwaze]

Change description

This PR adds LoggingLinks as a KCC Resource

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• Run make ready-pr to ensure this PR is ready for review.
• Perform necessary E2E testing for changed resources.

[google-oss-prow]

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[yuwenma]

Ah, no need to write this file anymore. apis/logging/v1alpha1/link_reference.go is autogenerated, where ResolveLoggingLogBucketRef equals to NormalizedExternal

[yuwenma]

You don't need to update the pkg/clients/generated any more (I'm curious, is there any doc asking you to do so?). They are the legacy way to generate the go client lib. With the direct approach, we uses the sig-kubernetes controller-gen and the apis/logging is enough. Here's the announcement if you are interested https://github.com/GoogleCloudPlatform/k8s-config-connector/blob/master/pkg/clients/generated/README.md