This produces a directory following the Angular Package layout spec.
Includes integration test coverage by making a minimal ng_package in integration/bazel.
Unit tests verify the content of the @angular/core and @angular/common packages.
This doesn't totally match our current output, but is good enough to unblock some
early adopters.
It re-uses logic from the rollup_bundle rule in rules_nodejs. It should also
eventually have the .pack and .publish secondary targets like npm_package rule.
PR Close#22221
The CLI app is now checked in, rather than generated dynamically with
`ng new`. This loses some assertion power, but gains hermeticity.
It also checks in lock files for all integration tests, avoiding
floating version numbers.
We'll need another place to integration test between changes in
the various repositories - but the angular/angular PR-blocking status
is not the right place to do this.
PR Close#21555
Alex Eagle