* ✨ Add Campaign Resource with get all and send operation
* ✨ Add Campaign Resource with get all and send operation
* 🚧 Add Get and Delete operation
* ✨ Add Campaign resource to the mailchimp node
* ⚡ Improvements to #1015
* ⚡ Small improvement
Co-authored-by: Harshil <ghagrawal17@gmail.com>