Improve the format of distro-dependencies

We wanted that we could define separate groups of distro dependencies. Currently, we define them all in one group. And when users use --install-distro-packages in kde-builder, they have no choise, everything is installed.

Instead, I propose we define some additional info for each dependency. Such as: required by which modules.

For example, for arch.yaml:

# Build systems
- ninja
# not specifying the required-by would mean the package is mandatory

- zxing-cpp:
    required-by:
      - spectacle
- gtk3:
    required-by:
      - workspace