Groundwork for WASI debugging

[rvanasa]

This PR adapts the logic from this WASI polyfill file for a headless Node.js environment.

Progress:

• Refactor to TypeScript
• Decouple Wasm functionality from user interface
• Expose hexdump() and show() functions
• Allow custom handling of debug_print output
• Run WASI modules from a file for quick testing (creating tests/wasm/Debug.test.wasm will activate another unit test)

Future work:

• Source maps?
• JS return value?
• Breakpoints?
• Stack inspection?

[github-actions]

size-limit report 📦

Path	Size
lib/index.js	15.3 KB (+13.05% 🔺)
packages/latest/base.json	87.82 KB (0%)
versions/latest/moc.min.js	487.72 KB (0%)
versions/latest/moc_interpreter.min.js	280.9 KB (0%)
versions/latest/didc.min.js	60.46 KB (0%)