• I've read, understood, and done my best to follow the CONTRIBUTING guidelines.

This pull request includes (pick all that apply):

• Bugfixes
• New features
• Breaking changes
• Documentation updates
• Unit tests
• Other

Summary

Handle network failures by adding a new error case for network failures and updating the error handling logic for refresh token API for this new case.

Implementation

• Added a new error case networkFailure to the OAuth2Error enum to represent network failures.
• Updated the errorFrom method to accept an additional error parameter and return OAuth2Error.networkFailure for network-related errors.
• Modified the call to errorFrom to pass the new error parameter.

Test Plan

1. Test Refresh Token API and verify if the error returning OAuth2Error.networkFailure when received network error (NSURLDomainErrorCode is < 0).