ENH: unzip support for download

[jklenzing]

Description

Addresses #103

Adds support to unzip files after download for zip files. Users can now specify a 'zip_method' as part of the download tags, which will send the zipped file to a temporary directory and extract it to the archival location.

Current version supports 'zip' only, but could be expanded for other file types later.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested with pysatModels at pysat/pysatModels#132

Test Configuration:

• Operating system: Monterrey
• Version number: Python 3.10.9
• Any details about your local setup that are relevant

Checklist:

• Make sure you are merging into the develop (not main) branch
• 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
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• Add a note to CHANGELOG.md, summarizing the changes
• Update zenodo.json file for new code contributors

If this is a release PR, replace the first item of the above checklist with the release
checklist on the wiki: https://github.com/pysat/pysat/wiki/Checklist-for-Release

[jklenzing]

Needs a test for the new bits of code. The only routine that uses this is in pysatModels. Potentially we can create a test object with a few zipped files hosted here.

[jklenzing]

Removed the gz support for now since the TIMED datasets have other problems. Can be expanded in the future.

Moving forward without tests for the time being to support pysatModels.

[jklenzing]

Documented need for tests and possible solutions as #213.

[jklenzing]

Coverage change consistent with new lines of code.