Rename SBT module customerGroups into customers.
Update release notes for reducing SBT modules.
Removing legacy-play-sdk SBT module, to use the legacy client two library depedency declarations are necessary.
Remove Scala SDK SBT module.
Rename SBT module folder name from customerGroups to customers.
Split module dependencies for client and models.
Move queries test files to common.
Make sbt modules, folder names and artifact ids consistent.