My intention is to manage the packages of ACC through Source Control and CICD process.
How do I go about this?
Do we have any command line scripts that could be executed for ACC and/or ACS?
There is no command line, etc. available in ACS anyway.
Also no public API to handle package import/export.
ACC has command line calls which you could use:
Import package file: nlserver package -instance:<instance> -import:<file>
Export package defined in XML file: nlserver package -instance:<instance> -export:<file> -specFile:<PackageFile>