[ACTION] Sendgrid "Campaign sends"

[sergio-eliot-rodriguez]

Is there a specific app this action is for?
Twilio Sendgrid

Please provide a link to the relevant API docs for the specific service / operation.
https://www.twilio.com/docs/sendgrid/ui/sending-email/how-to-send-email-with-marketing-campaigns#create-a-single-send

Context:
the specific additional functions im requesting is with regards to creating Single Sends (campaign sends rather than single recipient emails) on #13986