refactor: htsget-lambda and misc deployment changes

[mmalenic]

Closes #258

Changes

• Use the htsget-axum router for htsget-lambda, avoiding the need for most of the htsget-lambda library code.
• Update tests to include testing some more error conditions.
• Fix the Dockerfile.dockerignore and use htsget-axum in the Dockerfile.
• Update the deployment to allow creating stateful buckets which are populated with the data in the data directory.
  • The docs are updated to clarify the difference between s3BucketResources and the new createS3Buckets.

[mmalenic]

Updates

• Deployment now has a dedicated example_deploy.toml, with options to create a bucket and copy test data.
  • The deployment should work out of the box, and is public by default.
  • Add warnings in README.md and printed log message about the public deployment.

The only umccr-specific thing left to remove is the hosted zone domain name. I can't think of a way to get rid of this other than just not using a hosted zone, and instead using the ApiGW default endpoint URL.