[FEATURE] support WhatsApp templates/messages

[JoernBerkefeld]

seems to be assetType 230 (wa template message & wa session message), 235 (wa templates)

looks like there is not HTML but lots of configuration in json instead

https://help.salesforce.com/s/articleView?id=sf.mc_rn_2024_spring_whatsapp_transactional_api.htm&type=5