Add trusted-set-session-storage-item scriptlet

Related discussion:
uBlockOrigin/uAssets#20630 (comment)

Author: gorhill

assets/resources/scriptlets.js

@@ -3870,6 +3870,19 @@ function trustedSetLocalStorageItem(key = '', value = '') {
     setLocalStorageItemFn('local', true, key, value);
 }
 
+builtinScriptlets.push({
+    name: 'trusted-set-session-storage-item.js',
+    requiresTrust: true,
+    fn: trustedSetSessionStorageItem,
+    world: 'ISOLATED',
+    dependencies: [
+        'set-local-storage-item.fn',
+    ],
+});
+function trustedSetSessionStorageItem(key = '', value = '') {
+    setLocalStorageItemFn('session', true, key, value);
+}
+
 /*******************************************************************************
  * 
  * trusted-replace-fetch-response.js