Change product name to LottieSPM

[mBellar]

This pull request addresses the potential naming conflict between the original Lottie package and the forked Lottie-spm package. To prevent conflicts and enable seamless integration of both packages, the product name in the Lottie-spm package has been updated.

[calda]

I don't think we can do this, because I believe it is a breaking change for consumers.

To test how this would affect consumers, I followed these steps:

1. Update the Example Xcode project to depend on lottie-spm via the github.com repo, using version 4.4.0.
2. Verify that the app could build and successfully.
3. Update the Example Xcode project to depend on the rename-to-LottieSPM branch.
   • (I temporarily pushed a copy of your PR changes to the rename-to-LottieSPM branch in this repo)
4. Observe that the build now fails, with 🛑 Missing package product 'Lottie'.

Since this change can cause a build failure for existing consumers, we should leave it as-is.

[calda]

SPM module aliasing may help resolve any naming conflicts you're encountering: https://github.com/apple/swift-evolution/blob/main/proposals/0339-module-aliasing-for-disambiguation.md

[mBellar]

Thanks for your detailed analysis. I agree with your assessment.

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