Fix memory leak in owner (#2245)

* Fix: memory leak on listeners for elements

---------

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>

packages/generational-box/src/lib.rs

@@ -66,6 +66,18 @@ impl<T, S: AnyStorage> Debug for GenerationalBox<T, S> {
 }
 
 impl<T, S: Storage<T>> GenerationalBox<T, S> {
+    /// Create a new generational box by leaking a value into the storage. This is useful for creating
+    /// a box that needs to be manually dropped with no owners.
+    #[track_caller]
+    pub fn leak(value: T) -> Self {
+        let mut location = S::claim();
+        location.replace_with_caller(
+            value,
+            #[cfg(any(debug_assertions, feature = "debug_ownership"))]
+            std::panic::Location::caller(),
+        )
+    }
+
     #[inline(always)]
     pub(crate) fn validate(&self) -> bool {
         #[cfg(any(debug_assertions, feature = "check_generation"))]