docs(python): Update example for writing to cloud storage

[nameexhaustion]

Add an example above the existing one that shows directly writing to S3 without additional dependencies.

The existing example is also adjusted to showcase writing a gzipped CSV to S3 using Python files - as that cannot yet be done natively.

ref #18040

[codecov]

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  Misses      45666    45666           
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[braaannigan]

@nameexhaustion You're probably aware of this but there is also some commentary about needing s3fs in the corresponding .md page

[nameexhaustion]

@nameexhaustion You're probably aware of this but there is also some commentary about needing s3fs in the corresponding .md page

Yes, we will need this for now as some functions such as read_csv still rely on those until they are phased out in a breaking release.