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)

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• 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.

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• The developer has added tests or explained why testing cannot be added.
• Included any necessary screenshots or gifs if it was a UI change.
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[pboyd]

Suggested change

	proxyCmd.Flags().StringVar(&proxyCfg.CatalogsConfigPath, "catalogs-path", proxyCfg.DisableService, "Path for Model Catalog source configuration yaml file")
	proxyCmd.Flags().StringVar(&proxyCfg.CatalogsConfigPath, "catalogs-path", proxyCfg.CatalogConfigPath, "Path for Model Catalog source configuration yaml file")

[pboyd]

What do you think about making this two flags? Something along these lines:

Suggested change

	proxyCmd.Flags().StringVar(&proxyCfg.DisableService, "disable-service", proxyCfg.DisableService, "Optional name of service/endpoint to disable, can be either \"catalog\" or \"registry\"")
	proxyCmd.Flags().BoolVar(&proxyCfg.EnableRegistryService, "registry-service", true, "If true, start the registry service")
	proxyCmd.Flags().BoolVar(&proxyCfg.EnableCatalogService, "catalog-service", true, "If true, start the catalog service")

[pboyd]

Unless there's an error, the final size of this map should be the number of catalogs:

Suggested change

	catalogs := make(map[string]ModelCatalogApi)
	catalogs := make(map[string]ModelCatalogApi, len(config.Catalogs))