Reexport any_spawner Executor for convenience

Signed-off-by: Darwin Boersma <darwin@sadlark.com>

src/lib.rs

@@ -50,6 +50,7 @@ pub mod prelude {
     pub use crate::handler::Handler;
     pub use crate::response::Body;
     pub use crate::utils::redirect;
+    pub use any_spawner::Executor;
     pub use http::StatusCode;
     pub use wasi::exports::wasi::http::incoming_handler::{IncomingRequest, ResponseOutparam};
 }