Add apollo options to gateway.load()

[kanopa]

Is your feature request related to a problem? Please describe.
Provide apollo config to gateway.load() for nestjs-federation package. Its allows to use apollo rover and load graphql schema through apollo studio, its also add possibility to see change log schema. This additionally solves the problem of starting several backends at the same time since IntrospectAndCompose throws an error if one of the servers did not have time to get up.

The disadvantage of this approach is that you will have to generate the hash key yourself, which is usually generated by Apollo

apolloConfig.keyHash = createSHA('sha512') .update(apolloConfig.key).digest('hex');

https://unpkg.com/browse/apollo-server-core@2.22.1/src/determineApolloConfig.ts

I think we can give the opportunity to forward these parameters and add this feature to the documentation and leave the “dangerous” functionality on the side of the package users

I see its something like this
Gateway typescript config

gateway?: GatewayConfig & { loadOptions?: Parameters<ApolloGateway['load']>[0] };

const { server: serverOpts = {}, gateway: gOpts = {} } = options;
    const { loadOptions, ...gatewayOpts } = gOpts
    const gateway: ApolloGateway = new ApolloGateway(gatewayOpts);
    await gateway.load(loadOptions);

    await super.start({
      ...serverOpts,
      plugins: [...(serverOpts.plugins || []), useApolloFederation({ gateway })],
    });