feat: add --include-direct

[joneugster]

No description provided.

[joneugster]

With the current logic there might be arrows between these first-degree imports if they directly import each other, but there are no arrows if one indirectly imports another...

Idk if that's just noise we can accept. I have the impression that drawing the indirect imports between these first-degree dependencies might be too complicated and not worth the effort.

EDIT: With the last edit they are filtered out: Nodes included via --include-direct have their dependencies stripped completely.

[joneugster]

Image 1: --mark-module (pointless on its own)

Image 2: --mark-module --include-direct

Image 3: --mark-module --include-deps

Image 4: --mark-module --include-direct --include-deps

Image 5: --include-direct