Initial version of Catalog Service

[dhirajsb]

Initial Version of Model Catalog Service

Description

Add a new Model Catalog service to model registry API. The API shares types with Model Registry service
to maximize the reuse of common properties.

How Has This Been Tested?

WIP

Merge criteria:

• All the commits have been [signed-off](https://github.com/kubeflow/community/tree/master/dco-signoff-hook#signing- off-commits) (To pass the DCO check)

• The commits have meaningful messages; the author will squash them after approval or in case of manual merges will ask to merge with squash.
• 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.

If you have UI changes

• The developer has added tests or explained why testing cannot be added.
• Included any necessary screenshots or gifs if it was a UI change.
• Verify that UI/UX changes conform the UX guidelines for Kubeflow.

[google-oss-prow]

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