[Scala] scala-akka-http-server support pekko-http using useApachePekko flag

[krrrr38]

Closes #15924

pekko is a fork of akka. akka has a license problem, so someone wants to use pekko-http instead akka-http. Now pekko-http 1.0.0 is released, so openapi-generator can support pekko-http.

In this PR, add useApachePekko flag into scala-akka-http-server. When using it, the generator generates pekko-http src.

bin/configs/scala-pekko-http-server.yaml generates pekko-http sources and checks them in the ci.

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
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• In case you are adding a new generator, run the following additional script :

  ./bin/utils/ensure-up-to-date
  

  Commit all changed files.
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