Improve transformers

Add syntactic sugar to shorten the boilerplate.

• Make out optional.
• Provide default for in (something like value)
• Allow single function without functions node
• Unittest for empty functions list.
• Followup issues created if necessary

added Statusnext Task labels

changed iteration to Sprint Jul 22, 2024 - Aug 4, 2024

assigned to @daniel

marked this issue as related to #150

changed iteration to Sprint Aug 5, 2024 - Aug 18, 2024

removed the relation with #150

marked this issue as blocked by #150

removed iteration Sprint Aug 5, 2024 - Aug 18, 2024