Create a message template

curl --request POST \
  --url https://dev.flextell.ai/api/v1/message-templates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Tenant: <x-tenant>' \
  --data '
{
  "name": "<string>",
  "subject": "<string>",
  "body": "<string>",
  "is_active": true
}
'

{
  "success": "<string>",
  "data": {
    "id": 123,
    "name": "<string>",
    "system_name": "<string>",
    "subject": "<string>",
    "body": "<string>",
    "is_active": true,
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "deleted_at": "2023-11-07T05:31:56Z"
  }
}