Enhance Data Collections UX

[christad92]

With the data collections released for users, we are collecting feedback and creating issues that would make the experience better for users. Some of these issues were identified before the production release #2815 but they were not considered crucial at the time so we've left them here for future consideration.

• Allow users to explore collections and their items via a UI
• Allow users to create collections via HTTP and the CLI
• Add Collections API support to code assist #2657
• Allow users to share a collection with other projects. #2855
• Allow users to export collection items with project.yaml