Add implementation for utoipa-actix-web bindings

Implements wrappers for `ServiceConfig`, `App`, `Scope` of actix-web.
This allows users to create `App` with collecting `paths` and `schemas`
recursively without registering them to `#[openapi(...)]` attribute.

Example of new supported syntax.
```rust
 use actix_web::{get, App};
 use utoipa_actix_web::{scope, AppExt};

 #[derive(utoipa::ToSchema)]
 struct User {
     id: i32,
 }

 #[utoipa::path(responses((status = OK, body = User)))]
 #[get("/user")]
 async fn get_user() -> Json<User> {
     Json(User { id: 1 })
 }

 let (_, mut api) = App::new()
     .into_utoipa_app()
     .service(scope::scope("/api/v1").service(get_user))
     .split_for_parts();
```

Relates #283 Relates #662
Closes #121 Closes #657

Cargo.toml

@@ -13,6 +13,7 @@ members = [
     "utoipa-scalar",
     "utoipa-axum",
     "utoipa-config",
+    "utoipa-actix-web",
 ]
 
 [workspace.metadata.publish]
@@ -26,4 +27,5 @@ order = [
     "utoipa-rapidoc",
     "utoipa-scalar",
     "utoipa-axum",
+    "utoipa-actix-web",
 ]

scripts/test.sh

@@ -6,7 +6,7 @@ set -e
 : "${CARGO:=cargo}"
 : "${CARGO_COMMAND:=test}"
 
-crates="${1:-utoipa utoipa-gen utoipa-swagger-ui utoipa-redoc utoipa-rapidoc utoipa-scalar utoipa-axum}"
+crates="${1:-utoipa utoipa-gen utoipa-swagger-ui utoipa-redoc utoipa-rapidoc utoipa-scalar utoipa-axum utoipa-config utoipa-actix-web}"
 
 for crate in $crates; do
     echo "Testing crate: $crate..."
@@ -44,5 +44,7 @@ for crate in $crates; do
         pushd utoipa-config/config-test-crate/
         $CARGO ${CARGO_COMMAND}
         popd
+    elif [[ "$crate" == "utoipa-actix-web" ]]; then
+        $CARGO ${CARGO_COMMAND} -p utoipa-actix-web
     fi
 done

utoipa-actix-web/Cargo.toml

@@ -0,0 +1,34 @@
+[package]
+name = "utoipa-actix-web"
+description = "Utoipa's actix-web bindings for seamless integration of the two"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+keywords = ["utoipa", "actix-web", "bindings"]
+repository = "https://github.com/juhaku/utoipa"
+categories = ["web-programming"]
+authors = ["Juha Kukkonen <[email protected]>"]
+rust-version.workspace = true
+
+[dependencies]
+utoipa = { path = "../utoipa", version = "5" }
+actix-web = { version = "4", default-features = false }
+actix-service = "2"
+once_cell = "1"
+
+[dev-dependencies]
+utoipa = { path = "../utoipa", version = "5", features = [
+    "actix_extras",
+    "macros",
+    "debug",
+] }
+actix-web = { version = "4", default-features = false, features = ["macros"] }
+serde = "1"
+
+[package.metadata.docs.rs]
+features = []
+rustdoc-args = ["--cfg", "doc_cfg"]
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(doc_cfg)'] }

utoipa-actix-web/LICENSE-APACHE

@@ -0,0 +1 @@
+../LICENSE-APACHE

utoipa-actix-web/LICENSE-MIT

@@ -0,0 +1 @@
+../LICENSE-MIT

utoipa-actix-web/README.md

@@ -0,0 +1,54 @@
+# utoipa-actix-web - Bindings for Actix Web and utoipa
+
+[![Utoipa build](https://github.com/juhaku/utoipa/actions/workflows/build.yaml/badge.svg)](https://github.com/juhaku/utoipa/actions/workflows/build.yaml)
+[![crates.io](https://img.shields.io/crates/v/utoipa-actix-web.svg?label=crates.io&color=orange&logo=rust)](https://crates.io/crates/utoipa-actix-web)
+[![docs.rs](https://img.shields.io/static/v1?label=docs.rs&message=utoipa-actix-web&color=blue&logo=data:image/svg+xml;base64,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)](https://docs.rs/utoipa-actix-web/latest/)
+![rustc](https://img.shields.io/static/v1?label=rustc&message=1.75&color=orange&logo=rust)
+
+This crate implements necessary bindings for automatically collecting `paths` and `schemas` recursively from Actix Web
+`App`, `Scope` and `ServiceConfig`. It provides natural API reducing duplication and support for scopes while generating
+OpenAPI specification without the need to declare `paths` and `schemas` to `#[openapi(...)]` attribute of `OpenApi` derive.
+
+Currently only `service(...)` calls supports automatic collection of schemas and paths. Manual routes via `route(...)` or
+`Route::new().to(...)` is not supported.
+
+## Install
+
+Add dependency declaration to `Cargo.toml`.
+
+```toml
+[dependencies]
+utoipa-actix-web = "0.1"
+```
+
+## Examples
+
+Collect handlers annotated with `#[utoipa::path]` recursively from `service(...)` calls to compose OpenAPI spec.
+
+```rust
+use actix_web::{get, App};
+use utoipa_actix_web::{scope, AppExt};
+
+#[derive(utoipa::ToSchema)]
+struct User {
+    id: i32,
+}
+
+#[utoipa::path(responses((status = OK, body = User)))]
+#[get("/user")]
+async fn get_user() -> Json<User> {
+    Json(User { id: 1 })
+}
+
+let (_, mut api) = App::new()
+    .into_utoipa_app()
+    .service(scope::scope("/api/v1").service(get_user))
+    .split_for_parts();
+```
+
+## License
+
+Licensed under either of [Apache 2.0](LICENSE-APACHE) or [MIT](LICENSE-MIT) license at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate
+by you, shall be dual licensed, without any additional terms or conditions.