v5.7.0

Improvements

• Add support for Metadata-related fields and endpoints @lgarber-akamai (#289)
• Make the autoscaler, control_plane, and k8s_version fields mutable @lgarber-akamai (#310)
• Use parse.quote for URL formatting @lgarber-akamai (#309)

CI Improvements

• Resolve intermittent issue in test_create_nb_node @ykim-1 (#312)
• Add smoke test suite and GitHub Actions workflow @ykim-1 (#306)
• Add twine check in linting workflow @zliang-akamai (#307)
• Remove installation of package requirements in PyPI publishing workflow @zliang-akamai (#308)