Open books from Github (#10670)

* Add open book option in UI

* Add dropdowns option on dialog

* Add flow logic

* Fetch releases and validate URL

* Add class for github books and shared file books

* Change code structure

* Unblock local copy + stack overflows

* Download books from github

* Remove unused files

* Clean code and use the openNotebookFolder command to open remote book

* Checkpoint

* Refactor remote book dialog model to only hold data

* Remove ApiWrapper and refactor createlocalcopy method

* Use sinon js framework instead of typemoq for testing remotebookController

* Remove api wrapper

* Add some tests

* Add more tests and address pr comments

* Address PR comments

* Fix remotebook broken tests

* Add download location in output channel and use openBook command

* Address PR comments

* Fix typos, print error message and remove failing test

* Print error message

* Separate tests in different files

* Declare controller variable inside extension.tst

Co-authored-by: chlafreniere <hichise@gmail.com>

extensions/notebook/src/dialog/remoteBookDialogModel.ts

@@ -0,0 +1,50 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { RemoteBook } from '../book/remoteBook';
+import { IRelease, IAsset } from '../book/remoteBookController';
+
+export class RemoteBookDialogModel {
+	private _remoteLocation: string;
+	private _releases: IRelease[];
+	private _assets: IAsset[];
+	private _book: RemoteBook;
+
+	constructor() {
+	}
+
+	public get remoteLocation(): string {
+		return this._remoteLocation;
+	}
+
+	public set remoteLocation(location: string) {
+		this._remoteLocation = location;
+	}
+
+	public get releases(): IRelease[] {
+		return this._releases;
+	}
+
+	public set releases(newReleases: IRelease[]) {
+		this._releases = newReleases;
+	}
+
+	public get assets(): IAsset[] {
+		return this._assets;
+	}
+
+	public set assets(newAssets: IAsset[]) {
+		this._assets = newAssets;
+	}
+
+	public get remoteBook(): RemoteBook {
+		return this._book;
+	}
+
+	public set remoteBook(newBook: RemoteBook) {
+		this._book = newBook;
+	}
+
+}