Make requestCertificateForLocalhost sync

What's Changed

• requestCertificateForLocalhost changes
  • becomes sync
  • serverCertificateAltNames renamed altNames
  • serverCertificateValidityDurationInMs renamed validityDurationInMs
  • serverCertificateCommonName renamed commonName
  • returns { certificate, privateKey } instead of { serverCertificate, serverPrivateKey }

Full Changelog: v1.1.0...v2.0.0