API v2

[vnugent]

A placeholder issue to outline v2. More TBD.

1. Keep the existing API
2. Create a v2 API - this will allow our web and mobile app to incrementally adopt new queries/mutations

Chores:

• chore: upgrade apollo to v4 and fix related issues #429
• Support api versioning #430
• Use Mongo _id instead of UUID for primary key #432