Can you add cosmos db as a dev container choice?

[dfberry]

The setup for the cosmos db emulator to run from a docker container requires a few steps that aren't super obvious for dev containers. The Cosmos DB emulator would be a great 1st party additional to dev containers.

Relates to: <Codespaces | Remote - Containers | Both> Containers

[bamurtaugh]

Thanks for opening!

If this is a request to add a new dev container to this repo, we are currently working on how to best support current and future contributions to this repo. There are additional details in this issue: https://github.com/microsoft/vscode-dev-containers/issues/1291.