imagebitmap: Add missing basic functionality (#37025)

Add missing basic functionality for ImageBitmap
https://html.spec.whatwg.org/multipage/#imagebitmap
including new variant of creation bitmap with source rectangle
https://html.spec.whatwg.org/multipage/#dom-createimagebitmap
but without support of cropping bitmap data with formatting.

Add ImageBitmap to CanvasImageSource union type
https://html.spec.whatwg.org/multipage/#canvasimagesource

Add ImageBitmap to TexImageSource for WebGL
https://registry.khronos.org/webgl/specs/latest/1.0/index.html

Testing: Improvements in the following WPT tests
 - html/canvas/element/manual/imagebitmap/*
 - html/canvas/element/manual/wide-gamut-canvas/*
 - html/semantics/embedded-content/the-canvas-element/*
 - webgl/tests/conformance/textures/image_bitmap_from*
 - webmessaging/postMessage_cross_domain_image_transfer_2d.sub.htm

Fixes: https://github.com/servo/servo/issues/34112

Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>

components/script/dom/htmlmediaelement.rs

@@ -520,6 +520,10 @@ impl HTMLMediaElement {
         }
     }
 
+    pub(crate) fn network_state(&self) -> NetworkState {
+        self.network_state.get()
+    }
+
     pub(crate) fn get_ready_state(&self) -> ReadyState {
         self.ready_state.get()
     }