Create tests for reading compressed tables from S3 URLs

[dhimmel]

In #14576, we consolidated compression code and expanded support for compressed URLs. While we added tests for compressed URLs, we did not add tests for compressed S3 files. First, someone will have to upload the compressed tables to Amazon: see #14587 (comment).

Also tagging #13137, a pull request which may want to also add these tests.

[TomAugspurger]

👍 I can add those in #13137.

[dhimmel]

@TomAugspurger great. I put the compressed URL tests in pandas/io/tests/parser/test_network.py. Adding the S3 tests there would probably not take too much additional code.

[mroeschke]

Looks like test_network.py has some tests that read S3 files that are compressed (gz and bz2), so I think that should suffice the spirit of this issue. Closing.