Initial GraphQL setup

[pelle]

This sets up Apollo Client, React and the first iteration of a graphql schema.

• Sets up initial schema in root.ts
• Wires up apollo-link-schema in Apollo Client
• Wraps ApolloProvider and ReduxProvider for interop
• adds basic Identity queries for querying redux state for me (currentIdentity), accounts etc
• connects sql query functions from lib/sagas/databaseSaga to schema
• Wired up unused Accounts with graphql and listed it under more for testing the setup

With this setup it should be easy to wire in the sql work from @simonas-notcat into the graphql schema.

[jasheal]

I think we will need mutations too if we are to use graphql as our proxy to SQLite. Eg. We would have a createClaimMutation and signClaimMutation. Essentially all our create actions like create identity, writing to BC all should be mutations. The nice thing about mutations is that the callback can be configured to refetch the resource and cache it. We can also do optimistic cache updates so the ui updates immediately and only changes if there’s a conflict.

[jasheal]

@simonas-notcat @mi-xu @pelle

Another thing to consider for scalability (to cloud) is to have 2 graohQL proxy layers similar to how Prisma works. We have a database proxy that maps exactly to the database. The types describe the database 1:1 and then we have a application layer with app specific logic that sends its queries and mutations to the root database later. We can then just simply move the database layer to the cloud when the time comes.