feat: support banner and footer

[Timeless0911]

Summary

This PR implements the banner and footer feature.

We use bannerPlugin of Rspack to add banner and footer in js/css build.

Notice:

1. only string type is supported and will not be wrapped in a comment.
2. The default stage is PROCESS_ASSETS_STAGE_OPTIMIZE_SIZE + 1 to prevent avoid influence of minimizers
3. If you have further demand on banner and footer, you can directly use bannerPlugin.

type BannerAndFooter = {
  js?: string;
  css?: string;
  dts?: string;
};

interface LibConfig extends RsbuildConfig {
  banner?: BannerAndFooter;
  footer?: BannerAndFooter;
}

Since support of css of bundleless mode is not ready, we ignore css banner and footer tests in bundleless mode.

Related Links

Checklist

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