Refactor FPRScreenTraceTracker to use CADisplayLink.targetTimestamp

[tejasd]

Discussion

• The existing implementation of screen traces was based on the 60 FPS screen rate
• Newer devices can have a variable frame rate
• This solution uses CADisplayLink.targetTimestamp to calculate a dynamic frame rate

Testing

• This change still needs to be tested on ProMotion devices
• Unit tests cover changes - but don't include the logic for targetTimestamp

API Changes

• Verify (and update) that apps would need to add this Info.plist key to track frame rates on ProMotion devices

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