Cleaning ADAL token cache on Android and iOS

SecureStorageService.cs

public class SecureStorageService : ISecureStorageService
{
    public void RemoveAdalRecords()
    {
        try
        {
            var query = new SecRecord(SecKind.GenericPassword);
            SecKeyChain.Remove(query);
        }
        catch (Exception ex)
        {
            // log the error
        }
    }
}