This schematic will be executed when an Angular CLI user runs ng add @angular/localize.
It will search their angular.json file, and find polyfills and main files for server builders.
Then it will add the @angular/localize/init polyfill that @angular/localize needs to work.
If the user specifies that they want to use $localize at runtime then the dependency will be
added to the depdendencies section of package.json rather than in the devDependencies which
is the default.