refactor(snapshots): to their own crate (#14794)

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

runtime/examples/hello_runtime.rs

@@ -58,6 +58,7 @@ async fn main() -> Result<(), AnyError> {
     shared_array_buffer_store: None,
     compiled_wasm_module_store: None,
     stdio: Default::default(),
+    startup_snapshot: None,
   };
 
   let js_path =