dev: make VirtualMachine::get_traceback_entries pub

[ksew1]

Make VirtualMachine::get_traceback_entries pub

Description

Made VirtualMachine::get_traceback_entries so it can be used in starknet-foundry backtrace feature

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.
  • CHANGELOG has been updated.

[gabrielbosio]

Hi, @ksew1, thanks for contributing! I have some questions:

• Why does Scarb need this function for the backtrace feature?
• How does this feature currently work without this function?

Also, as a side note: The VM also defines get_traceback which might be sufficient.

[ksew1]

Hi, @ksew1, thanks for contributing! I have some questions:

* Why does Scarb need this function for the backtrace feature?

* How does this feature currently work without this function?

Also, as a side note: The VM also defines get_traceback which might be sufficient.

How does this feature currently work without this function?

This is how it is currently done

Why does Scarb need this function for the backtrace feature?

We need pc as we map them to function names and lines using annotations for compiler