[dart_ci] Add recipe to build CIPD package with executable for dart_ci scripts

Change-Id: I8652bfd241c5b3f94a61c5f33e666ba16985081e
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/203504
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Karl Klose <karlklose@google.com>
4 files changed