Supporting a 'wasm:' prefix on imports

首先阅读 ComponentizeJS issue 的讨论，并跟踪其中所示的 JavaScript imports 是如何处理的，包括被描述为位于 ComponentizeJS 上方和下方的更改。只有在社区就前缀达成一致，并且所选形式能够端到端地用于 WASI 或 WebAssembly 组件 imports 后，工作才算完成。

Right now, code that uses imports via WASI look like regular imports, with the package name being the first indicator:

import { someFn } from "ns:pkg/iface@0.1.0";

export const run = {
    run() { ... }
}

This works, but I think going forward life for embedders and tooling/ecosystem projects will be much easier if we prefix these imports with wasi: (or something similar) to note them/control how the imports are done.

The idea is that the above code would turn into:

import { someFn } from "wasi:ns:pkg/iface@0.1.0";

export const run = {
    run() { ... }
}

There are other ways to indicate the type of an import/control (i.e. import attributes, for example) , but prefixing with wasi: is incredibly simple and offers a point of leverage -- being able to easily tell which imports are "wasi"/underlying paltform imports. This mirrors the convention of node: as an import prefix which is used in more modern code bases (i.e. from "node:fs" rather than from "fs").

Changes may be required "below" and "above" componentize JS to make this work, but I figure that ComponentizeJS is a good place to discuss and eventually start this work.

[EDIT] I changed the title to wasm since wasi is clearly not the right prefix -- wasm:, wit:, component: or something else are clearly more correct, though it's not exactly clear which is best.