feat(clerk-js): Add bundleless ESM build

[dstaley]

Description

(This PR is technically a draft; the pr.pkg.new workflow doesn't run on draft PRs.)

This experimental PR adds support for building a "bundleless" version of clerk-js, specifically the ESM build. More details to come if this experiment proves successful!

Checklist

• [ ] pnpm test runs as expected.
• [ ] pnpm build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [ ] 🌟 New feature
• [ ] 🔨 Breaking change
• [ ] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

Summary by CodeRabbit

• Chores
  • Updated build configuration and dependencies to improve bundling and support for React and SVG assets.
  • Introduced a new build system configuration for ES module output targeting web environments.
  • Removed an outdated module build configuration to streamline the build process.
  • Improved documentation formatting by removing an extraneous blank line.