feat(@ngtools/webpack): replace bootstrap code for server apps

[FrozenPandaz]

This fixes an issue affecting people who are using AngularCompilerPlugin outside of the CLI

Example Repo:

https://github.com/FrozenPandaz/ng-universal-demo/tree/compilerplugin

npm run build:prod
npm run server

Error without Fix:

Error: No NgModule metadata found for 'ServerAppModule'.
    at NgModuleResolver.resolve (/home/jason/projects/ng-universal-demo/dist/server.js:60055:23)
    at CompileMetadataResolver.getNgModuleMetadata (/home/jason/projects/ng-universal-demo/dist/server.js:55024:60)
    at JitCompiler._loadModules (/home/jason/projects/ng-universal-demo/dist/server.js:74075:87)
    at JitCompiler._compileModuleAndComponents (/home/jason/projects/ng-universal-demo/dist/server.js:74036:36)
    at JitCompiler.compileModuleAsync (/home/jason/projects/ng-universal-demo/dist/server.js:73930:37)
    at CompilerImpl.compileModuleAsync (/home/jason/projects/ng-universal-demo/dist/server.js:144994:49)
    at PlatformRef.bootstrapModule (/home/jason/projects/ng-universal-demo/dist/server.js:7981:25)
    at Object.<anonymous> (/home/jason/projects/ng-universal-demo/dist/server.js:110213:91)
    at __webpack_require__ (/home/jason/projects/ng-universal-demo/dist/server.js:20:30)
    at /home/jason/projects/ng-universal-demo/dist/server.js:63:18

[filipesilva]

I'm ok with the transform itself. @Brocco can you review platform-server usage cases?

[Brocco]

LGTM

[odahcam]

Does it got published in any Angular version? We that are using MarkPieszak/aspnetcore-angular2-universal still with problems in ordinary angular@~5.0.0 configs. :/

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