feat(webdriver): support geckodriver for macos-aarch64

[nananchi]

Make sure these boxes are checked! 📦✅

• You have the latest version of rustfmt installed

$ rustup component add rustfmt

• You ran cargo fmt on the code base before submitting
• You reference which issue is being closed in the PR text
  • wasm-pack 0.13.1 installs wrong geckodriver binary on M2 Mac: x86_64, not arm64  #1449

✨✨ 😄 Thanks so much for contributing to wasm-pack! 😄 ✨✨

Introduces support to download Geckodriver in macOS aarch64 based on artifacts available
in Mozilla's releases: https://github.com/mozilla/geckodriver/releases.