Add `onLogoutPreviousUserFailed` delegate to the `IterableAuthDelegate`

[woosiki-prestolabs]

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✏️ Description

I am a iOS software engineer at PrestoLabs and was asked by Daryl Greaves to make a PR what I requested specifications. I requested the specifications below but I only made this PR for 3rd one.

1. Can I use disableDeviceForAllUsers when I set autoPushRegistration as true?

• I got a response that I can use disableDeviceForAllUsers.

2. Could you make a patch that retry register api when it failed by network error?

• I found a onFailure callback when register api was failed.
• IterableAPI.register(token: Data, , onSuccess: OnSuccessHandler? = nil, onFailure: OnFailureHandler? = nil)

3. Could you make a patch that notify when unregister device failed by 401 error?

[woosiki-prestolabs]

I have a question about function of disableDeviceForAllUsers. I call this when jwt token already disabled, but it still fail as {"msg":"JWT Authorization header is not set","code":"BadAuthorizationHeader","params":null}. Did you know how I can disable device for all users when user already logged out?