GraphQL server

[bvrooman]

GraphQL Server. The GraphQL Server serves the GraphQL API that is available to the client. The GraphQL Server is a wrapper for the FuelService Rust API and is responsible for converting GraphQL types into backend-agnostic Rust types that the FuelService API can use.

Blocked by:

• Fuel Service client backend #1126

Acceptance Criteria:

• Move existing GraphQL server logic over to a new GraphQL Server implementation
• The GraphQL Server API exposes all queries and mutations necessary
• The GraphQL Server wraps the FuelService API

[MitchTurner]

From what we can gather from offline context, this is about moving the the GraphQL code out of the fuel-core service, and have it be it's own service (possibly along with an indexer service, etc for off-chain data).

Seems like this would be a different approach to #1569