migrate from shellfish to rustyline with enhanced CLI features

[JoshuaBatty]

Description

This PR migrates the forc debug CLI from shellfish to rustyline, providing enhanced interactive debugging features. Key improvements include:

• Command history with persistence
• Intelligent command completion for debugger commands, register names, and transaction files
• Command suggestions/corrections for typos
• Contextual hints showing command descriptions

The migration also reorganizes the CLI code into separate modules for better maintainability while preserving all existing debugger functionality.

See video below for demo.

debug.cli.mp4

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.