Cloud-based CSV example notebook additions

[d33bs]

Description

This PR adds a cloud-based CSV demonstration alongside the SQLite demonstration within the example notebook for cloud-based work. Along the journey towards this I also found there was a small bug with cloud-based SQLite file processing and fixed it (had to do with cached results).

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have deleted all non-relevant text in this pull request template.

[jenna-tomkinson]

LGTM! I add some questions and comments but overall looks like a simple and clean addition to demonstrate CytoTables ability to work on cloud with CSVs :)

[d33bs]

Thanks @jenna-tomkinson !