Add iOS specific parsers : DataUsage.sqlite & com.apple.identityservices.idstatuscache.plist

[rgayon]

Context: https://www.amnesty.org/en/latest/research/2021/07/forensic-methodology-report-how-to-catch-nso-groups-pegasus/#_ftn1

iOS maintains records of process executions and their respective network usage in two SQLite database files called “DataUsage.sqlite” and “netusage.sqlite” which are stored on the device.

record of Apple IDs seen by each installed application in a plist file located at /private/var/mobile/Library/Preferences/com.apple.identityservices.idstatuscache.plist

We already have parsers for these file formats so I suppose what we need is some test data to figure out the schema

[rick-slin]

I'd like to work on this issue. I was thinking of making two PRs, one per file.