Provide server errors via the NSUnderlyingErrorKey #10913
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Historically, FirebaseStorage deconstructs and reconstructs underlying server errors into a different format. With this PR, we also provide the original underlying error via the more standard
NSUnderlyingErrorKey.Also add three types of tests:
NSUnderlyingErrorKey.unknownSwift error (not from server) to help clarify FirebaseStorage.StorageError provides limited information #10889A more complete solution to #10889 can be addressed with a small breaking change in the next major release.