chore: upgrade template to Rspack 2.0 rc.1

[SyMind]

Summary

This PR updates rspack-binding-template to be compatible with Rspack 2.0 (rc.1), including Rust workspace dependency bumps, regenerated binding typings, and Node.js engine requirements aligned with Rspack 2.0.

Key changes

• Deps/Tooling
  • Rust workspace: edition 2024, deps bumped to =0.100.0-rc.1, napi updated, toolchain refreshed and add rust-src.
  • JS: upgrade to @rspack/core@2.0.0-rc.1; update lockfile accordingly.
• Runtime compatibility
  • Add engines.node: ">=20.19.0 <21 || >=22.12.0" (root + binding package) and update README note.
  • Update index.js to correctly load @rspack/core when the callable export is default, while preserving named exports via Object.assign.
• Bindings
  • Regenerate index.d.ts / index.js to match upstream API changes (notably JsSource types, new plugin/tap kinds, JsCoordinator, etc.).
• Rust plugin
  • Use RawStringSource for banner injection to match updated rspack_sources.

Notes

• This is a template upgrade; downstream projects should also move to Node 20.19+ / 22.12+ when adopting Rspack 2.0.