perf: get resolve in external plugin

[SyMind]

Summary

Directly implement the getResolve method through NAPI to avoid the overhead of constructing JsResolver multiple times.

In this Next.js benchmark case https://github.com/SyMind/shadcn-ui/tree/next-rspack, build performance improved from 17s to 16s.

Before

After

Related links

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	dd13d32
🔍 Latest deploy log	https://app.netlify.com/projects/rspack/deploys/687e0b15007236000857cb1a

[github-actions]

📦 Binary Size-limit

Comparing dd13d32 to fix: emit error for esm duplicate export (#11112) by Gengkun

❌ Size increased by 15.38KB from 48.91MB to 48.92MB (⬆️0.03%)

[codspeed-hq]

CodSpeed Performance Report

Merging #11111 will not alter performance

_{Comparing perf-external-get-resolve (dd13d32) with main (46c867e)}

Summary

✅ 16 untouched benchmarks

[Copilot]

Pull Request Overview

This PR optimizes performance in the external plugin by replacing the Resolver-based approach with a more efficient resolve mechanism. The change aims to improve resolution performance when handling external dependencies.

• Replaces Resolver class usage with getRawResolve adapter function
• Implements direct resolution using ctx.getResolve() instead of creating new Resolver instances
• Moves resolution logic from TypeScript to Rust for better performance

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/rspack/src/builtin-plugin/ExternalsPlugin.ts	Refactors getResolve method to use new adapter-based resolution approach
crates/rspack_binding_api/src/raw_options/raw_external.rs	Adds native Rust implementation of get_resolve method with improved performance

Comments suppressed due to low confidence (3)

packages/rspack/src/builtin-plugin/ExternalsPlugin.ts:83

• [nitpick] Variable names 'res' and 'rej' are abbreviated. Consider using 'resolve' and 'reject' for better readability.

									return new Promise((res, rej) => {

crates/rspack_binding_api/src/raw_options/raw_external.rs:122

• [nitpick] Variable name 'first' is ambiguous. Consider a more descriptive name like 'base_resolve_options' or 'default_resolve_options'.

    let first = Arc::new(self.resolve_options_with_dependency_type.clone());

crates/rspack_binding_api/src/raw_options/raw_external.rs:123

• [nitpick] Variable name 'second' is ambiguous. Consider a more descriptive name like 'merged_resolve_options' or 'override_resolve_options'.

    let second = Arc::new(