[discuss] Elastic Package Scripts

What do you think about refactoring elastic-package a bit to be also available as a public library, which can be used to implement scripts?

I see few use cases around massive package modification:

1. Update fields in all packages, because some of them have been published in ECS repository.
2. Bump up versions in packages ready for release (maybe also: mark of them as GA/beta?).
3. Rename text properties in manifests (title, descriptions) for purposes of Elastic docs publishing.
4. Update ECS version to next version.

Inspirational post: https://blog.arduino.cc/2020/07/06/the-three-pillars-of-the-arduino-cli

@masci @jsoriano