Added skipOver method to PackedBundle

[dokleina]

Closes #1337

Context, Motivation & Description

Adds the skipOver method to PackedBundle, which enables specification of gaps in packing without needing explicitly calculated bit positions (i.e., packFrom or packTo).

Impact on code generation

None

Checklist

• Unit tests were added
• API changes are or will be documented:
  • using Scaladoc comments: /** */?
  • on RTD?
  • thanks to a new tracking issue on RTD?

[Dolu1990]

Thanks ^^