Add option for indexing ZIP files

[kkrauth]

The CLI does not support passing an argument to indicate that the ZIP file being uploaded should be indexed as per
https://learn.akamai.com/en-us/webhelp/netstorage/netstorage-http-api-developer-guide/GUID-75696F3E-39E7-49F0-90FC-CDC2FACBBEAB.html

index-zip=1: Include this to enable az2z processing of an uploaded “.zip” archive file, this will index the archive for use with the “Serve from Zip” feature. Serve from Zip requires each archive to have an index, and have a “.zip” extension.

[kkrauth]

The way that Akamai is running their open source projects is, frankly, embarrassing and reflects poorly on the whole organization. The repositories are abandoned or poorly maintained, with open issues dating back years. If you can't get funding or priority to maintain these, you are much better off taking everything off of GitHub and offering it as a downloadable binary instead.