src/vs/workbench/api/common/extHostCommands.ts/ExtHostCommands/$executeContributedCommand
class ExtHostCommands:	$executeContributedCommand(id: string, ...args: any[]): Promise<unknown> {
		this._logService.trace('ExtHostCommands#$executeContributedCommand', id);

		if (!this._commands.has(id)) {
			return Promise.reject(new Error(`Contributed command '${id}' does not exist.`));
		} else {
			args = args.map(arg => this._argumentProcessors.reduce((r, p) => p.processArgument(r), arg));
			return this._executeContributedCommand(id, args, true);
		}
	}