Add Tiktok Ads fields(showcase_products,shopping_ads_type)#1065

There are some fields are not in the Windsor Tiktok Ads list, but are existing in Tiktik APIs, could you please add them refer to below informations?

1. showcase_products in ad_id level, the API link is https://business-api.tiktok.com/portal/docs?id=1735735588640770
2. shopping_ads_type in ad group level, refer to link: https://business-api.tiktok.com/portal/docs?id=1739314558673922

shopping_ads_type was added