AWS S3 IO through KvikIO

[madsbk]

Implement remote IO read using KvikIO's S3 backend.

For now, this is an experimental feature for parquet read only. Enable by defining CUDF_KVIKIO_REMOTE_IO=ON.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[pmattione-nvidia]

Wondering about long-term: If we're given an http or https URI, how would we tell whether that's on amazon s3 vs some other cloud service?

[pmattione-nvidia]

E.g. if users rely on https automatically working for s3, then we need to change how https works in the future, could their code break.

[madsbk]

Good point, I have limited the support to s3:// urls for now.
KvikIO also supports regular http servers but let's address that in a later PR.

[vuule]

great stuff!
few small comments

[shrshi]

Overall looks good to me!

[madsbk]

@rjzamora do you have anything else?

[rjzamora]

Thanks for this @madsbk (very exciting)!

[madsbk]

Thanks all!

[madsbk]

/merge