Update Lambda examples to use S3 Express

[changhiskhan]

This is currently blocked by apache/arrow-rs-object-store#106

We need:

1. New API documentation from AWS to know what needs to be updated
2. arrow-rs has to be updated
3. arrow-rs needs to be released
4. datafusion needs to update
5. lance can then update

to test things out, we can certainly just fork arrow-rs and datafusion to create a new custom build.