tvOS metadata files

[DellaBitta]

Description

Provide details of the change, and generalize the change in the PR title above.

Update the build scripts to produce tvOS .unitypackage files containing tvOS metadata files and fat library support for devices and simulators.

Removed the export of `"libCrashlyticsiOSWrapper.a" which doesn't seem to be produced by the build system since we've moved to cmake. Instead the symbols are part of the standard Crashlytic libraires on iOS and tvOS.

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Testing

Describe how you've tested these changes.

• Executed scripts locally.
• Created unitypackages with a subset of platforms, and with all of the platforms supported by macOS builds (iOS, Android, macOS, tvOS).
• Imported the unitypackages into the Unity version 2020 and 2021 LTS.

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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