The birthday field of contacts should be included in the response when using the gog contacts get command.

Current Behavior
Currently, when retrieving contact information via gog contacts get, the birthday field is not included in the returned data.

Desired Behavior
The gog contacts get command should return the birthday field along with other contact information.

Use Case
Having access to birthday information is essential for:

Setting up birthday reminders
Sending automated birthday greetings
Integrating contact birthdays into calendar applications
Maintaining complete contact profiles