fix: added a persistence layer over keys stored in standard defaults by rudderstack

[desusai7]

fix: added a persistence layer over keys stored in standard defaults by rudderstack.

• Added RSDefaultsPersistence (persistence layer for standard defaults), which stores a copy of the Standard defaults in a .plist file and adds them back to the Standard defaults on the next launch if they were deleted by the app developer but not by the SDK itself.
• Upon migrating to a version of SDK that contains RSDefaultsPersistence from an SDK version that doesn't contain it, we will do a one-time copy of Rudderstack-related user defaults from standard defaults to the persistence layer.
• Every time we do a read/write/delete to the standard defaults, we perform the same on the persistence layer to maintain the same state.
• We cannot eliminate the usage of Standard defaults to maintain backward compatibility.
• This will fix the issues where clearing of standard defaults by the app developer leads to inconsistencies in the behaviour of the SDK.

[sonarcloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
75.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud