fix: avoid import external module re-assigin in concatenation

[fi3ework]

Summary

This PR will simplify "module" external type's runtime like below. When building a package with Rspack, it can be ensured that external modules can be tree shaken.

Changes summary:

1. only changed "module" external type.
2. variable name folding theoretically should not cause any potential problems, as there is currently no module remapping, it merely eliminates intermediate variables.
3. MultiTaskProcessor could handle function config.

// --- before ---
import * as __WEBPACK_EXTERNAL_MODULE_react_alias__ from "react-alias";

;// CONCATENATED MODULE: external "react-alias"

const external_react_alias_namespaceObject = __WEBPACK_EXTERNAL_MODULE_react_alias__;

;// CONCATENATED MODULE: ./src/main.mjs

function main() {
    (0,external_react_alias_namespaceObject.createElement)('div');
}

// --- after ---
import * as __WEBPACK_EXTERNAL_MODULE_react_alias__ from "react-alias";

;// CONCATENATED MODULE: external "react-alias"

;// CONCATENATED MODULE: ./src/main.mjs

function main() {
    (0,__WEBPACK_EXTERNAL_MODULE_react_alias__.createElement)('div');
}

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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