support s3 versioning

[cole-brokamp]

Currently, download a file with:

s3_get("s3://geomarker-io/pollution/pm25/90vvq8.qs")

What if we could download a specific version of a file with:

s3_get("s3://geomarker-io/pollution/pm25/90vvq8.qs@gWbN2AoEbodfJO394C70QW2ZxdlSjeuT")

or use this code to get tag / semantic version associated with github release?

https://github.com/geomarker-io/CODECtools/blob/991f010ea67495fe625386e9c91c2fe4b61bc01c/R/codec.R#L137-L154