Plat 10223 deterministic device ids

[kstenerud]

Goal

Implement the same persistent device ID code as was implemented in bugsnag-cocoa-performance.

As bugsnag-cocoa uses two device IDs (one for internal bugsnag events), the code has been expanded to save both values (and this change is being backported to bugsnag/bugsnag-cocoa-performance#177).

As a result, both bugsnag-cocoa and bugsnag-cocoa-performance will store the exact same information in this shared file.

Testing

Added unit tests to confirm the structure and location of the shared persistent device ID file.

[github-actions]

Bugsnag.framework binary size increased by 5,400 bytes from 707,904 to 713,304

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  [ = ]       0 -41.6% -5.27Ki    [__LINKEDIT]
  +0.8% +5.27Ki  [ = ]       0    TOTAL

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