[FR] Add --include parameter as a counterpart to --ignore

Description

I would like to request the addition of an --include parameter to the changeset version command. This parameter would serve as a counterpart to the existing --ignore parameter.

Current Problem

The --ignore parameter requires specifying all packages except the one you want to release. This can be cumbersome, especially when you only want to release a single package.

Usage Example

changeset version --include <package-name>

This command would only version the specified package(s).