Implement import stripper for JSKit-less and WASI-less binary

[kateinoigakukun]

When testing a JSKit linked binary by carton test, it always requires --environment defaultBrowser even if the binary doesn't use JS related features at all while testing.

It's also useful to make WASI-less binary from current our WASI binaries.
There is a similar tool in Rust community, but it would be useful to implement it here for carton integration.
https://github.com/rustwasm/wasm-snip