Update dev graphql to 16 and add in peerDependency

[m1heng]

solve #1199

[m1heng]

All test reports "cannot extend type because it is not defined" like error.
Throwing from

federation/subgraph-js/src/buildSubgraphSchema.ts

Lines 65 to 71 in ff079db

	let schema = buildSchemaFromSDL(
	modules,
	new GraphQLSchema({
	query: undefined,
	directives: [...specifiedDirectives, ...federationDirectives],
	}),
	);

Input of this function has not changed. So weird.

[m1heng]

All test reports "cannot extend type because it is not defined" like error. Throwing from

federation/subgraph-js/src/buildSubgraphSchema.ts

Lines 65 to 71 in ff079db

	let schema = buildSchemaFromSDL(
	modules,
	new GraphQLSchema({
	query: undefined,
	directives: [...specifiedDirectives, ...federationDirectives],
	}),
	);

Input of this function has not changed. So weird.

problem located apollographql/apollo-tooling#2474

[m1heng]

After manually changed apollo-graphql source code in node_modules locally, all tests passed.
PR for the needed change is made apollographql/apollo-tooling#2534. Once that is merged and released, let's update dependency version here, and everything should be good.

[m1heng]

Job done in #1129.