Refactor the `ofrak_pyghidra` standalone `unpack` function

[rbs-afflitto]

Based on feedback in #637

Which files would be affected?

disassemblers/ofrak_pyghidra/src/ofrak_pyghidra/standalone/pyghidra_analysis.py

Does the proposed maintenance include non-doc string functional changes to the Python code?

No

Are you interested in implementing it yourself?