WebUI: implement debounce behavior for resize events

src/webui/www/private/scripts/misc.js

@@ -32,6 +32,7 @@ window.qBittorrent ??= {};
 window.qBittorrent.Misc ??= (() => {
     const exports = () => {
         return {
+            createDebounceHandler: createDebounceHandler,
             friendlyUnit: friendlyUnit,
             friendlyDuration: friendlyDuration,
             friendlyPercentage: friendlyPercentage,
@@ -50,6 +51,18 @@ window.qBittorrent.Misc ??= (() => {
         };
     };
 
+    const createDebounceHandler = (delay, func) => {
+        let timer = -1;
+        return (...params) => {
+            clearTimeout(timer);
+            timer = setTimeout(() => {
+                func(...params);
+
+                timer = -1;
+            }, delay);
+        };
+    };
+
     /*
      * JS counterpart of the function in src/misc.cpp
      */