fix: mark trackingoptions as atomic to prevent issues from concurrent access

[crleona]

Summary

I've been able to reproduce the crash mentioned in #498 with the following initialization:

let amp = Amplitude.instance(withName: "foo")
amp.initializeApiKey("...")
amp.logEvent("test")
DispatchQueue.global().async {
     while true {
          amp.setTrackingOptions(AMPTrackingOptions().disableLatLng())
     }
}    

It seems this is caused by concurrent access to tracking options, so I've marked the related variables as atomic.

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• Does your PR have a breaking change?: no

[github-actions]

🎉 This PR is included in version 8.19.3 🎉

The release is available on:

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• v8.19.3

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