feat(axum): support axum 0.8 applications

Upgrade the integration crate and examples to Axum 0.8 and use the native async extractor traits while preserving hemx routing, request, runtime, and effect behavior.

req: axum/002

hemx-axum/src/lib.rs

@@ -1,4 +1,3 @@
-use axum::async_trait;
 use axum::body::{to_bytes, Body};
 pub use axum::extract::State;
 use axum::extract::{FromRequest, FromRequestParts, Multipart};
@@ -91,7 +90,6 @@ impl PageRequest {
     }
 }
 
-#[async_trait]
 impl<S> FromRequestParts<S> for PageRequest
 where
     S: Send + Sync,
@@ -1237,7 +1235,6 @@ impl IntoResponse for InteractionFormRejection {
     }
 }
 
-#[async_trait]
 impl<S> FromRequest<S> for InteractionRequest
 where
     S: Send + Sync,
@@ -1251,7 +1248,6 @@ where
     }
 }
 
-#[async_trait]
 impl<S> FromRequest<S> for InteractionForm
 where
     S: Send + Sync,