Apollo's federated inline tracing plugin

`@envelop/useApolloInlineTrace` plugin which alters the result `extensions` field to include tracing information.

References:
- [Federated trace data](https://www.apollographql.com/docs/federation/metrics/)
- [Apollo's inline trace plugin](https://www.apollographql.com/docs/apollo-server/api/plugin/inline-trace/)
- [`ApolloServerPluginInlineTrace`](https://github.com/apollographql/apollo-server/blob/main/packages/apollo-server-core/src/plugin/inlineTrace/index.ts)
- [`TraceTreeBuilder`](https://github.com/apollographql/apollo-server/blob/main/packages/apollo-server-core/src/plugin/traceTreeBuilder.ts)

Additional things:
- [Apollo's `GraphQLRequestMetrics`](https://github.com/apollographql/apollo-server/blob/9389da785567a56e989430962564afc71e93bd7f/packages/apollo-server-types/src/index.ts#L120-L133)