[Federation] Add queryHash to GraphQLExecutor

[Pruxis]

Currently due to core-package not allowing queryHash

You have the following error when building an ApolloGateway with Typescript.

Property 'executor' in type 'ApolloGateway' is not assignable to the same property in base type 'GraphQLService'.
  Type '<TContext>(requestContext: WithRequired<GraphQLRequestContext<TContext>, "document" | "operation" | "queryHash">) => Promise<GraphQLExecutionResult>' is not assignable to type 'GraphQLExecutor<Record<string, any>>'.
    Types of parameters 'requestContext' and 'requestContext' are incompatible.
      Type 'WithRequired<GraphQLRequestContext<Record<string, any>>, "document" | "operationName" | "operation">' is not assignable to type 'WithRequired<GraphQLRequestContext<Record<string, any>>, "document" | "operation" | "queryHash">'.
        Type 'WithRequired<GraphQLRequestContext<Record<string, any>>, "document" | "operationName" | "operation">' is not assignable to type 'Required<Pick<GraphQLRequestContext<Record<string, any>>, "document" | "operation" | "queryHash">>'.
          Property 'queryHash' is optional in type 'GraphQLRequestContext<Record<string, any>> & Required<Pick<GraphQLRequestContext<Record<string, any>>, "document" | "operationName" | "operation">>' but required in type 'Required<Pick<GraphQLRequestContext<Record<string, any>>, "document" | "operation" | "queryHash">>'.ts(2416)

By allowing queryHash this should be fixed.