build(zone.js): zone.js should output esm format for fesm2015 bundles

[JiaLiPassion]

Zone.js support Angular package format since 0.11, but the fesm2015 bundles
are not esm format, it still use umd bundle which is not correct, in this PR,
a new esm bundle output is added in rollup_bundle rule under tools, so
zone.js can use the new rule to generate esm bundles.

Before this PR, fesm2015/zone.js is a umd bundle.

(function (factory) {
    typeof define === 'function' && define.amd ? define(factory) :
    factory();
}((function () { 'use strict';

    /**
     * @license
     * Copyright Google LLC All Rights Reserved.
     *
     * Use of this source code is governed by an MIT-style license that can be
     * found in the LICENSE file at https://angular.io/license
     */
    const Zone$1 = (function (global) {
        const performance = global['performance'];
        ...

now it is a esm bundle.

const Zone$1 = (function (global) {
    const performance = global['performance'];
    ...

[IgorMinar]

The rest looks good to me. Can you please clarify why we have the minified debug output there? is it actually necessary for something?

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