Forwarder script is added to AshScriptPlugin

[Seetaramayya]

#1392

[lightbend-cla-validator]

Hi @Seetaramayya,

Thank you for your contribution! We really value the time you've taken to put this together.

We see that you have signed the Lightbend Contributors License Agreement before, however, the CLA has changed since you last signed it.
Please review the new CLA and sign it before we proceed with reviewing this pull request:

http://www.lightbend.com/contribute/cla

[muuki88]

Thanks a lot. LGTM.

You only need to add the MIMA problem filters to this file:
https://github.com/sbt/sbt-native-packager/blob/master/src/main/mima-filters/1.3.15.backward.excludes

You can find the error in the github action output

[Seetaramayya]

I hope force push is not causing dismissing of stale review ( I rebased on to the master so I have to force push )