Groundwork for WASI debugging

[rvanasa]

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

Progress:

• [x] Refactor to TypeScript
• [x] Decouple Wasm functionality from user interface
• [x] Expose hexdump() and show() functions
• [x] Allow custom handling of debug_print output
• [x] 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[bot]]

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%)