Get a list with all emails of the authenticated user.
    (See https://developer.google.com/v3/users/emails/#list-email-addresses-for-a-user).

def get_user_emails(headers:dict=HEADERS) -> list:
    """
    Get a list with all emails of the authenticated user.
    (See https://developer.google.com/v3/users/emails/#list-email-addresses-for-a-user).
    """
    url = _build_url("user", "emails")
    data = _get(url, headers=headers)
    return [Email(email=e.get("email", None), is_primary=e.get("primary", False))
                    for e in data]