test: Setup wasi-testsuite with Node.js adapter

[kateinoigakukun]

Based on #57

[bjorn3]

In #42 @jsoverson is working on adding testing in the browser using the wasi tests of the wasmtime test suite. How does wasi-testsuite relate to this? Either way I think testing in both node.js and a headless browser makes sense.

[kateinoigakukun]

Currently wasi-testsuite is a part of test suite of wasmtime (https://github.com/bytecodealliance/wasmtime/tree/main/tests/wasi_testsuite). Compared with the wasmtime's their own test suite, It provides pre-compiled wasm-wasi binaries and test harness, so it's much simpler and easier. I think it's good starting point to avoid regression and see the project implementation status.

[bjorn3]

LGTM with a single nit. In the future I would also like testing in an actual browser like #42 does, but testing in just node.js is already a big improvement.