#39: Update cloudformation templates

[kaklakariada]

Closes #39

This migrate JS Lambdas to NodeJS 20 and AWS SDK v3 (see cloudformation_template_diff_1.0.4-2.0.0.patch for the actual changes):

• Fix imports
• Remove unnecessary .promise() calls
• Fix base64-encoding of encrypted passwords: KMS function encrypt() now returns a Uint8Array instead of a Buffer

Additionally:

• Cleanup Python script that polls until the cluster is fully started, improve log output
• Remove support for “bring your own license” AMI images which are not supported