feat: Decouple MParticle.m for Swift Migration

[denischilik]

Summary

First stage of mParticle.m refactoring where some classes were moved from mParticle.m to their own files.
These classes were covered with tests. And obj-c tests were rewritten in swift.

Testing Plan

• Was this tested locally? If not, explain why.

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://rokt.atlassian.net/browse/SDKE-60

[BrandonStalnaker]

Could you detail how you tested this besides unit tests?

[denischilik]

Could you detail how you tested this besides unit tests?

Could you clarify what kind of additional testing you have in mind apart from unit tests? Since this change is purely a refactor without any business logic modifications, I focused on ensuring coverage with unit tests.

[BrandonStalnaker]

Just some basic smoke tests. Get some events to show on the live stream in the cocoapods Example app and Higgs app. I understand that a lot of this is just cut and paste/reorganization but considering we know the unit tests are lacking we can't only rely on them and this is a fairly big change.

[denischilik]

Just some basic smoke tests. Get some events to show on the live stream in the cocoapods Example app and Higgs app. I understand that a lot of this is just cut and paste/reorganization but considering we know the unit tests are lacking we can't only rely on them and this is a fairly big change.

I have checked with both the Example and Higgs apps, and confirmed that live events still show up as expected.

[BrandonStalnaker]

LGTM, thanks for putting up with my requests 😆

[nickolas-dimitrakas]

LGTM, went over majority of this in person. Only comment is to maybe cancel the job that has been running for over 5 hours native-unit-tests (iOS, mParticle-Apple-SDK-NoLocation). It seems to be hung on BackendController Unit Tests with the last output being:
Test Case '-[MPBackendControllerTests testAutomaticSessionEnd]' started.

[mparticle-automation]

🎉 This PR is included in version 8.38.0 🎉

The release is available on GitHub release

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