feat: support webpack 2.4 chunk name annotation for "async-import"

[pglazkov]

Since version 2.4 Webpack supports annotating import() calls with the name of the chunk:

import(/* webpackChunkName: "my-chunk-name" */ "module")

This pull request adds the implementation of adding that annotation comment if the "chunkName" option is provided as part of the route, like so:

loadChildren: 'app/module-container/child-module#ChildModule?chunkName=my-chunk-name'

[shaungrady]

This would be wonderful to have. @shlomiassaf Is this project still being supported?

[pglazkov]

@shaungrady As an alternative you might want to try angular-named-lazy-chunks-webpack-plugin - it automatically generates chunk names based on the module names, so you don't need to add any annotations in code.