Feature: make test_utils macros public

[odesenfans]

This PR makes all macros in the test_utils module public to allow for easier testing of hints (and other features) living in other crates/repositories.

Fixes #1595.

Checklist

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

[odesenfans]

This PR should be mergeable. Most of the macros need to be public as they are used in public macros. I addressed all the comments that could be.

[fmoletta]

Hello! Making these macros public in the current state involves making a lot of fields internal to the VM public which is not desirable at all. I think we should address this task in a different way. What these macros currently do can be implemented using the vm's public api, so we should re-implement or implement new macros that use the public api instead.

[odesenfans]

Ok @fmoletta then let's close this PR, no worries.