ref: Add aiofile to do async file operations

[cbornet]

Add aiofile to do async file operations.
NB: true async is only on Linux. For Mac and Windows, ops are delegated to threads.

[codspeed-hq]

CodSpeed Performance Report

Merging #4705 will degrade performances by 18.15%

_{Comparing cbornet:aiofile (c9a5801) with main (a1fa8ec)}

Summary

❌ 1 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	cbornet:aiofile	Change
❌	test_successful_run_with_output_type_debug	178.1 ms	217.5 ms	-18.15%

[ogabrielluiz]

LGTM