feat: add test execution in debug mode

[flferretti]

This PR adds a test debug mode, allowing users to set up a test environment and select a specific test to execute.

• Added a new --test CLI option to DebugOpts that allows users to run tests in debug mode and optionally specify the test index to focus on.
• Updated DebugData to include a test_index field, enabling the selection of a specific test for debugging; logic added to handle default and explicit test index values. [1] [2]
• Enhanced the debug_recipe function in src/lib.rs to support test debug mode: sets up the test environment, validates the test index, displays available tests, and provides instructions for running tests after environment setup. [1] [2] [3]

Fixes #1951
Fixes #655

[flferretti]

Hi @wolfv! Just a quick ping to see if you’ve had a chance to look at this :) Thank you!