fix(core): expose ipc::Invoke (#11290)

.changes/expose-invoke.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch:bug
+---
+
+Export the `ipc::Invoke` struct.

crates/tauri/src/ipc/mod.rs

@@ -195,7 +195,6 @@ impl Response {
 /// The message and resolver given to a custom command.
 ///
 /// This struct is used internally by macros and is explicitly **NOT** stable.
-#[doc(hidden)]
 #[default_runtime(crate::Wry, wry)]
 pub struct Invoke<R: Runtime> {
   /// The message passed.