Add valid init types to URLSearchParams constructor

See https://url.spec.whatwg.org/#interface-urlsearchparams
Added sequence<sequence<USVString>> and record<USVString, USVString>.

Fixes microsoft#15338

Author: jacobrask

lib/lib.dom.d.ts

@@ -13916,7 +13916,7 @@ declare var URLSearchParams: {
     /**
       * Constructor returning a URLSearchParams object.
       */
-    new (init?: string | URLSearchParams): URLSearchParams;
+    new (init?: string | { [key: string]: string } | [string, string][] | URLSearchParams): URLSearchParams;
 }
 
 interface NodeListOf<TNode extends Node> extends NodeList {
@@ -15053,4 +15053,4 @@ type ServiceWorkerState = "installing" | "installed" | "activating" | "activated
 type Transport = "usb" | "nfc" | "ble";
 type VideoFacingModeEnum = "user" | "environment" | "left" | "right";
 type VisibilityState = "hidden" | "visible" | "prerender" | "unloaded";
-type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";
+type XMLHttpRequestResponseType = "" | "arraybuffer" | "blob" | "document" | "json" | "text";