feat: add rspack and rsbuild icons

[fi3ework]

resolve https://github.com/PKief/vscode-material-icon-theme/issues/2174.

• rspack config files as per https://www.rspack.dev/config.html#supported-configuration-file-formats
• rsbuild config files as per https://rsbuild.dev/guide/basic/configure-rsbuild#configuration-usage

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[fz6m]

Should we add the rspress icon ?