feat: provide version info with ng-packagr --version cli option

[dherges]

I'm submitting a...

[ ] Bug Fix
[x] Feature
[ ] Other (Refactoring, Added tests, Documentation, ...)

Checklist

• Commit Messages follow the Conventional Commits pattern
  • A feature commit message is prefixed "feat:"
  • A bugfix commit message is prefixed "fix:"
• Tests for the changes have been added

Description

$ ng-packagr --version
ng-packagr:            2.0.0-rc.6
@angular/compiler:     5.1.0
@angular/compiler-cli: 5.1.0
rollup:                0.52.1
tsickle:               0.25.5
typescript:            2.5.3

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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