src/vs/workbench/api/browser/mainThreadComments.ts/MainThreadComments/$createCommentThread
class MainThreadComments:	$createCommentThread(handle: number,
		commentThreadHandle: number,
		threadId: string,
		resource: UriComponents,
		range: IRange | ICellRange,
		extensionId: ExtensionIdentifier,
		isTemplate: boolean
	): languages.CommentThread<IRange | ICellRange> | undefined {
		const provider = this._commentControllers.get(handle);

		if (!provider) {
			return undefined;
		}

		return provider.createCommentThread(extensionId.value, commentThreadHandle, threadId, resource, range, isTemplate);
	}