fix: add onscrollend event type (#10337)

* feat: add scrollend type

* Update .changeset/tame-cycles-kneel.md

Author: arslanastral

.changeset/tame-cycles-kneel.md

@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+fix: add `scrollend` event type

packages/svelte/elements.d.ts

@@ -351,6 +351,9 @@ export interface DOMAttributes<T extends EventTarget> {
 	'on:scroll'?: UIEventHandler<T> | undefined | null;
 	onscroll?: UIEventHandler<T> | undefined | null;
 	onscrollcapture?: UIEventHandler<T> | undefined | null;
+	'on:scrollend'?: UIEventHandler<T> | undefined | null;
+	onscrollend?: UIEventHandler<T> | undefined | null;
+	onscrollendcapture?: UIEventHandler<T> | undefined | null;
 	'on:resize'?: UIEventHandler<T> | undefined | null;
 	onresize?: UIEventHandler<T> | undefined | null;
 	onresizecapture?: UIEventHandler<T> | undefined | null;