add castToModule to persistent

Author: mookums

src/v8.zig

@@ -936,6 +936,13 @@ pub fn Persistent(comptime T: type) type {
             };
         }
 
+        /// Should only be called if you know the underlying type is a v8.Module.
+        pub fn castToModule(self: Self) Module {
+            return .{
+                .handle = @as(*const c.Module, @ptrCast(self.handle)),
+            };
+        }
+
         /// Should only be called if you know the underlying type is a v8.PromiseResolver.
         pub fn castToPromiseResolver(self: Self) PromiseResolver {
             return .{