Transformer: Add support for grouping modules

[ruben-iteng]

Transformer: Add support for grouping modules

Description

Bundle modules into KiCad groups for easier manipulation.

• some level of depth control would be nice
• set root of hierarchy
• naming of the groups based on...

Checklist

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• My code follows the coding guidelines of this project
• My PR title is following the contribution guidelines
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• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
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[ruben-iteng]

RFC: extracting the hierarchy from somewhere, and where to apply this.
Made a proto with adding the faebryk module name to a kicad field (generally handy), and extracting from there. Seems like this is not really the proper way of doing this though 😅