Cosmos DB provider

[grahamehorner]

Note: This issue is for discussion and questions about the EF Core Cosmos provider.

Issue #12086 is tracking the work being done on the implementation.

---

Please consider creating entity framework core providers for Cosmos DB.

[divega]

We should consider investing on this. Keeping it in the backlog for now because we don't have short term plans for it.

[divega]

We are going to start investigating this in 2.1. We have a lot of work to do to figure out what the goals should be for EF Core support for Cosmos DB in the short and long term, e.g. from answering basic questions like what value EF Core support should bring to the table to which exact APIs of Cosmos DB we should support.