Add LocalizedError inheritance for thrown errors

[AvdLee]

Errors for localizedDescription now only print:

AppStoreConnect_Swift_SDK.APIProvider.Error

While it should be something like:

response {
    "errors": [{
        "status": "401",
        "code": "NOT_AUTHORIZED",
        "title": "Authentication credentials are missing or invalid.",
        "detail": "Provide a properly configured and signed bearer token, and make sure that it has not expired. Learn more about Generating Tokens for API Requests https://developer.apple.com/go/?id=api-generating-tokens"
    }]
}).

[SwiftLeeBot]

The pull request #185 that closed this issue was merged and released as part of Release 2.1.0 🚀
Please let us know if the functionality works as expected as a reply here. If it does not, please open a new issue. Thanks!

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