Fix crash on tvOS caused by access to filesystem

[jpstuehler]

Describe the bug

The app will crash when it tries to write the event to disk.

To Reproduce

Setup a tracker and start tracking events on tvOS using tracker 2.1.1. Setting up the session file url fails and the tracker then crashes when writing data to disk.

SPSession.m line 133.
Error Domain=NSCocoaErrorDomain Code=513 "You don’t have permission to save the file “snowplow” in the folder “Application Support”." UserInfo={NSFilePath=/var/mobile/Containers/Data/Application/1107C145-BB29-40BA-AA29-DD2960253083/Library/Application Support/snowplow, NSUnderlyingError=0x281850150 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

SPSession.m line 227 then crashes because of the failure above.

Expected behavior

Creating this directory should not fail and writing to disk should work.

Device information (please complete the following information):

• Device: Apple TV
• OS: 14.6
• Tracker Version: 2.1.1 integrated via SwiftPM

[jpstuehler]

Thanks for tackling this. Didn't anticipate this being such a big change 🙌