Add a feature to resolve dependencies for Bundle API

[fz6m]

When using the bundle API, we may import CSS from third-party dependencies with @import.

e.g.

// style.css

@import "./common.css";
@import "bootstrap/dist/css/bootstrap.min.css"

// ...

Avoid the overhead of passing functions to Rust, we can add a parsing dependency entry point configuration (maybe projectRoot or new config ).

An example of parse the path:

  const resolve = require("enhanced-resolve");

  resolve(projectRoot, "bootstrap/dist/css/bootstrap.min.css"

( we can use libraries like parcel-resolver or rspack-resolver )

Related to #747 , fz6m/lightningcss-loader#8 (comment)