Request - more fine grained error messages on iOS

[robrechtme]

Hi

We see some occurrences of Error: unable to zip popping up on Sentry. However, we have zero clue what went wrong for those particular users.

Looking at the code of RNZipArchive.m, I see 4 different occurrences of

NSError *error = nil;
reject(@"zip_error", @"unable to zip", error);

Would it be possible to have a bit more fine-grained error messages?
If you want, I can look into making a PR. However I am not that familiar with the library or iOS development in general.