webgpu: Update to wgpu 0.20 (#32173)

* Update wgpu to 0.20

* good expectations

* Throw TypeError in configure on unsupported format instead of panic

* Expect

* `into_command_buffer_id`,`into_command_encoder_id`

components/script/dom/webidls/WebGPU.webidl

@@ -1048,6 +1048,7 @@ interface GPUCanvasContext {
 
     // Calling configure() a second time invalidates the previous one,
     // and all of the textures it's produced.
+    [Throws]
     undefined configure(GPUCanvasConfiguration descriptor);
     undefined unconfigure();