Exploration: Better transferring of TypedArrays used in Webview.postMessage (#115664)

* Improve passing of ArrayBuffers to and from webviews

Fixes #115807

* Serialize and restore typed arrays too

This also makes it so that if you pass the same ArrayBuffer twice in an object, we use a single object on the receiver side too

* Fix spelling

* Require VS Code 1.56+

src/vs/workbench/api/common/extHostWebviewView.ts

@@ -146,7 +146,10 @@ export class ExtHostWebviewViews implements extHostProtocol.ExtHostWebviewViewsS
 		}
 
 		this._viewProviders.set(viewType, { provider, extension });
-		this._proxy.$registerWebviewViewProvider(toExtensionData(extension), viewType, webviewOptions);
+		this._proxy.$registerWebviewViewProvider(toExtensionData(extension), viewType, {
+			retainContextWhenHidden: webviewOptions?.retainContextWhenHidden,
+			serializeBuffersForPostMessage: false,
+		});
 
 		return new extHostTypes.Disposable(() => {
 			this._viewProviders.delete(viewType);