fix: Remove @inlinable from ApolloAPI to enable xcframework builds

[calvincestari]

Closes #2555

This PR enables BUILD_LIBRARY_FOR_DISTRIBUTION to be used when building an xcarchive which in turn enables building of an xcframework.

• Removes @inlinable where needed from ApolloAPI function declarations.
• This does not change our stance on Library Evolution, it is still not officially supported. If there is a way in the future to disassociate swiftinterface generation from the BUILD_LIBRARY_FOR_DISTRIBUTION build setting we will likely make that choice.
• This does not change our stance on Carthage, we are still moving away from officially supporting it.

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