WACZ reading / streaming

[matteocargnelutti]

(Suggested by @ikreymer)

Add a command and associated API for reading and streaming the contents WACZ files, either locally or remotely.

See: https://www.npmjs.com/package/unzipit

[matteocargnelutti]

(Suggested by @rebeccacremona)

This feature should allow for specialized / simplified extractions such as:

• Extracting the CDX of a WACZ
• Extracting the datapackage signature
• Looking up for a specific record in the underlying WARC(s)
• etc...

[ikreymer]

Previously also prototyped a very simple zip (not wacz) loader that can stream a file from zip, mostly using it myself, but recently put it up here: https://github.com/ikreymer/loadzip/blob/main/index.js

Agreed WACZ-specific semantics would be very useful to have as well!