feat: create route handler macro

crates/tuono_lib_macros/src/lib.rs

@@ -0,0 +1,11 @@
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+mod handler;
+
+#[proc_macro_attribute]
+pub fn handler(args: TokenStream, item: TokenStream) -> TokenStream {
+    handler::handler_core(args, item)
+}
+
+