POC for trying out ksa support as 3rd party idP

[droot]

This PR adds support for new auth type gcpksa (BYOID) in config-sync.

[google-oss-prow[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

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[nan-yu]

replaced by https://github.com/GoogleContainerTools/kpt-config-sync/pull/1121