fix: Rename internal Swift.h header to avoid Expo conflicts

[einsteinx2]

Summary

We have an internal header called Swift.h used as a wrapper import. Due to it being project level (aka internal), it was thought the generic file name would not cause issues, but due to the way Expo does builds, it conflicts with their own Swift.h header.

This change renames that internal header and updates all imports statements.

Testing Plan

• [x] Was this tested locally? If not, explain why.
• Tested local build in Xcode

• Manually updated Expo test app dependency to use this change and confirmed successful build and run npx expo run:ios

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

• Closes https://go.mparticle.com/work/SQDSDKS-6578

[mparticle-automation]

:tada: This PR is included in version 8.25.1 :tada:

The release is available on GitHub release

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