Is your feature request related to a problem? Please describe.

https://pekko.apache.org/

apache pekko is fork of akka. Someone want to migrate into pekko-http from akka-http because of a license issue.

Describe the solution you'd like

Support scala-pekko-http-server generator instead scala-akka-http-server.

Additional context

• release notes for 1.0.0 release apache/pekko#334
• https://pekko.apache.org/docs/pekko/current/project/migration-guides.html
• https://pekko.apache.org/docs/pekko-http/current/migration-guide/index.html