[feature] Version field in manifest

[sigmuha]

This issue is a feature request to have a version field for the package in the manifest Bender.yml file.

A version field in the manifest would be useful for CI in a merge, where this field is read by the pipeline, and checked to see if it already exists (error), or if it should be created after the merge. I'm sure this is useful in other contexts as well.

Proposed structure:

package:
    name: <package_name>
    version: <package_version> # NEW FIELD