feat: Update API for contact avatar (#4719)

Added the ability to update the contact's avatar via API and Dashboard.

- Contact create and update APIs can now accept avatar attachment parameters [form data].
- Contact create and update endpoints can now accept the avatar_url parameter.[json]
- API endpoint to remove a contact avatar.
- Updated Contact create/edit UI components with avatar support

Fixes: #3428

swagger/definitions/request/contact/create.yml

@@ -13,6 +13,12 @@ properties:
   phone_number:
     type: string
     description: phone number of the contact
+  avatar:
+    type: string <binary>
+    description: Send the form data with the avatar image binary or use the avatar_url
+  avatar_url:
+    type: string
+    description: The url to a jpeg, png file for the contact avatar
   identifier:
     type: string
     description: A unique identifier for the contact in external system

swagger/definitions/request/contact/update.yml

@@ -9,7 +9,13 @@ properties:
   phone_number:
     type: string
     description: phone number of the contact
-  identifier: 
+  avatar:
+    type: string <binary>
+    description: Send the form data with the avatar image binary or use the avatar_url
+  avatar_url:
+    type: string
+    description: The url to a jpeg, png file for the contact avatar
+  identifier:
     type: string
     description: A unique identifier for the contact in external system
   custom_attributes: