chore: Swagger documentation for contact labels APIs (#8279)

Co-authored-by: Sojan Jose <sojan@pepalo.com>

swagger/paths/application/contacts/labels/create.yml

@@ -0,0 +1,26 @@
+tags:
+  - Contact Labels
+operationId: contact-add-labels
+summary: Add Labels
+description: Add labels to a contact. Note that this API would overwrite the existing list of labels associated to the conversation.
+parameters:
+  - name: data
+    in: body
+    required: true
+    schema:
+      type: object
+      properties:
+        labels:
+          type: array
+          description: Array of labels (comma-separated strings)
+          items:
+            type: string
+responses:
+  200:
+    description: Success
+    schema:
+      $ref: '#/definitions/contact_labels'
+  404:
+    description: Contact not found
+  401:
+    description: Unauthorized

swagger/paths/application/contacts/labels/index.yml

@@ -0,0 +1,14 @@
+tags:
+  - Contact Labels
+operationId: list-all-labels-of-a-contact
+summary: List Labels
+description: Lists all the labels of a contact
+responses:
+  200:
+    description: Success
+    schema:
+      $ref: '#/definitions/contact_labels'
+  404:
+    description: Contact not found
+  401:
+    description: Unauthorized