[ACTION] Chat API for WhatsApp new actions

**Is there a specific app this action is for?**
WhatsApp

**Please provide a link to the relevant API docs for the specific service / operation.**
https://chat-api.com/en/

**Send Text** \| Send a text message to WhatsApp
**Send Image** \| Action to send an image
**Send Audio** \| Action to send audio
**Send Video** \| Action to send a video
**Send Document** \| Action to send a document
**Manual Opt-In** \| In order to initiate a WhatsApp message to a person, you must first receive opt-in permission confirming that they wish to receive future messages from you on WhatsApp. The opt-in must (a) clearly state that the person is opting in to receive messages from you over WhatsApp and (b) clearly state your business' name
**Get Balance** \| Action to get a balance, plan, monthly active users, renewal date
**Get Templates** \| Action to get a list of WhatsApp templates