Allow users to share a collection with other projects.

[christad92]

As a project owner or admin, I would love to be able to share my project collection with another project. By sharing the collection with the project, I don't need to pay for new collections or duplicate data across multiple projects (which can be hard to manage).

Notes:

• When we list collections in a project, we should indicate the projects that have access to a collection on the collections list.
• When sharing a collection with another project, we should block the share if the receiving project has a collection that has the same name as the shared collection.

[taylordowns2000]

@christad92 , can you elaborate on the motivation for wanting to share collections between projects? which users want this, and what does it help them do in the real world? if you share a real use can I'll better be able to wrap my head around this one.