Initial implementation of GPUDevice for WebGPU

Added the WebIDL bindigs for GPUDevice, GPUObjectDescriptorBase, GPUDeviceDescriptor, GPUObjectBase
Implemented the `requestDevice` function of `GPUAdapter`

components/script/dom/webidls/GPUObjectBase.webidl

@@ -0,0 +1,13 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// https://gpuweb.github.io/gpuweb/#gpuobjectbase
+[Exposed=(Window)]
+interface mixin GPUObjectBase {
+    attribute DOMString? label;
+};
+
+dictionary GPUObjectDescriptorBase {
+    DOMString? label;
+};