Adding installJestDom and installUserEvent as option to the ng-add schematic

[Hyperxq]

This pull request if for the issues:
#477
#472

With this change you need to update the documentation. The way to use both is:

ng add @testing-library/angular --install-jest-dom --install-user-event

By default both are in false for this reason, no matter if the users are still using as documentation.

@timdeschryver

[timdeschryver]

Thanks for the work @Hyperxq , I've added a comment

[Hyperxq]

@timdeschryver ready!

[timdeschryver]

Thanks!

[timdeschryver]

@all-contributors please add @Hyperxq for code

[allcontributors]

@timdeschryver

I've put up a pull request to add @Hyperxq! 🎉