GH-49 Dynamic API

[dzikoysk]

val app = Javalin.create { config ->
    config.registerPlugin(
        OpenApiPlugin {
            // new hooks system (internal plugin system)
            it.withHook(RegisteredRoutesHook())
        }
    )
    
    // automatically detects registered route + method + path parameters
    config.routes.get("/users") { }
    config.routes.post("/users") { }

    // allows to attach more metadata
    config.routes.addEndpoint(
        Endpoint.create(HandlerType.GET, "/users/{id}")
            .addMetadata(OpenApiMetadata {
                summary("Get a user")
                responses {
                    response("200") {
                        description("The user")
                        content { mediaType("application/json") { schema(User::class.java) } }
                    }
                }
            })
            .handler { }
    )
}