- create `juniper_axum` crate in Cargo workspace
- implement `graphql` default `axum` handler for processing GraphQL requests
- implement `extract::JuniperRequest` and `response::JuniperResponse` for custom processing GraphQL requests
- implement `subscriptions::graphql_transport_ws()` default `axum` handler for processing the new `graphql-transport-ws` GraphQL over WebSocket Protocol
- implement `subscriptions::graphql_ws()` default `axum` handler for processing the legacy `graphql-ws` GraphQL over WebSocket Protocol
- implement `subscriptions::serve_graphql_transport_ws()` function for custom processing the new `graphql-transport-ws` GraphQL over WebSocket Protocol
- implement `subscriptions::serve_graphql_ws()` function for custom processing the legacy `graphql-ws` GraphQL over WebSocket Protocol
- provide `examples/simple.rs` of default `juniper_axum` integration
- provide `examples/custom.rs` of custom `juniper_axum` integration
Additionally:
- fix `junper_actix` crate MSRV to 1.73
- add `test_post_with_variables()` case to integration `juniper::http::tests`
Co-authored-by: ilslv <ilya.solovyiov@gmail.com>
Co-authored-by: Christian Legnitto <LegNeato@users.noreply.github.com>
Co-authored-by: Kai Ren <tyranron@gmail.com>
