[#3] Debugger

Description

Implement the minimal set of features to make a debugger app.

This includes a small console application for debugging.

There is one severe UX problem which I don't resolve yet, to be handled in a dedicated MR for #101 (closed).

Related issue(s)

Resolves #3 (closed)

✅ Checklist for your Merge Request

Related changes (conditional)

• Tests (see short guidelines)

  • If I added new functionality, I stack exec morley-debugger-console -- run --contract contracts/lsl.tz --storage 1 --parameter 1added tests covering it.
  • If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.

• Documentation

  • I checked whether I should update the docs and did so if necessary:
    • README
    • Haddock
    • docs/
  • I updated the changelog if my changes are externally visible.

Stylistic guide (mandatory)

• My commits comply with the following policy.
• My code complies with the style guide.