Add GQL Server to Query Donor Summary data

[joneubank]

Adding the ability to query the data indexed by the Donor Aggregator. This functionality is currently available in the ARGO platform API, but will be moved into this service.

As the first step in this effort, we will set up a GQL server in this service. Similar work was done in the ARGO Clinical service - the intention is to use the same setup to provide GQL in this service.

Detailed Description

Integrate apollo graphql server into the Donor aggregator. To be consistent with ARGO Clinical, use

"@apollo/server": "4.0.0",

The outcome of this ticket would be to have a graphql playground link resolvable and the graphql server running on startup of the donor aggregator.

Possible Implementation

Reference the implementation in ARGO Clinical for consistency.

The standalone apollo server is started here: https://github.com/icgc-argo/argo-clinical/blob/develop/src/server.ts#L187
The gql schemas and resolvers are in the directory https://github.com/icgc-argo/argo-clinical/tree/develop/src/schemas