`init()` for `wasip2` reactor components

[rvolosatovs]

Currently, init() functions do not run in wasip2 reactor components run in Wasmtime 25.

A recent change to wasm-tools introduced support for _initialize in component new step bytecodealliance/wasm-tools#1747, however even with:

• wasm-tools 0.218
• tinygo 0.33

init() functions do not run in reactors, which manifests in e.g. stdio not being available and runtime panics e.g. printing to os.Stdout

It's possible that the outdated WASI-libc version is the cause here, I'll try updating it and report

Refs #4482

Update 1:

neither updating vendored wasi-libc to WebAssembly/wasi-libc@5ed3ec5, nor https://github.com/WebAssembly/wasi-libc/commits/wasi-sdk-22 seemed to have changed anything, but I'm also not familiar with the build process enough to know if I had to do something more that just go install to make sure TinyGo uses the latest wasi-libc