Proposed OpenAPI spec changes for catalog administration

[pboyd]

Description

These are proposed changes to the API spec for the model catalog to support admin functions from the dashboard. Specifically, it adds:

• A new endpoint to preview changes to a catalog source
• Unified fields for specifying models to include/exclude
• Status and error fields for sources

This is not intended to be merged, but we can take these changes as a starting point for implementation.

How Has This Been Tested?

N/A

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• [ ] The commits have meaningful messages
• [ ] Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [ ] The developer has manually tested the changes and verified that the changes work.
• [ ] Code changes follow the kubeflow contribution guidelines.

[google-oss-prow[bot]]

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[rareddy]

fyi, @mturley @andrewballantyne

[pboyd]

These changes have been implemented in other PRs. Closing.