Graphql Federation test

Command line to laubch the apps:

cd books && strawberry server --port 3500 app
cd reviews && strawberry server --port 3000 app

Command line to generate schema for supergraph:

rover supergraph compose --config ./supergraph.yaml --skip-update --elv2-license accept --output supergraph.graphql

Command line to launch Apollo router with federation:

./router --supergraph supergraph.graphql --log trace