feat: Ability to search conversation with message content (#1265)

- API end point which takes message content as search parameter
- end point supports additional filtering with labels and inbox ids
- swagger doc

swagger/paths/conversation/index_or_create.yml

@@ -39,6 +39,48 @@ get:
         $ref: '#/definitions/bad_request_error'
     description: Access denied
 
+get:
+  tags:
+    - Conversation
+  operationId: conversationSearch
+  description: Search for conversations containing a messages with the query string
+  summary: Conversations Search
+  parameters:
+    - name: q
+      in: query
+      type: string
+    - name: assignee_type
+      in: query
+      type: string
+      enum: ['me', 'unassigned', 'all']
+    - name: status
+      in: query
+      type: string
+      enum: ['open', 'resolved', 'bot']
+    - name: page
+      in: query
+      type: integer
+    - name: inbox_id
+      in: query
+      type: integer
+    - name: labels
+      in: query
+      type: array
+      items:
+        type: string
+
+  responses:
+    200:
+      description: Success
+      schema:
+        $ref: '#/definitions/conversation_list'
+    400:
+      description: Bad Request Error
+      schema:
+        $ref: '#/definitions/bad_request_error'
+    description: Access denied
+
+
 post:
   tags:
     - Conversation

swagger/swagger.json

@@ -283,10 +283,15 @@
         "tags": [
           "Conversation"
         ],
-        "operationId": "conversationList",
-        "description": "List all the conversations with pagination",
-        "summary": "Conversations List",
+        "operationId": "conversationSearch",
+        "description": "Search for conversations containing a messages with the query string",
+        "summary": "Conversations Search",
         "parameters": [
+          {
+            "name": "q",
+            "in": "query",
+            "type": "string"
+          },
           {
             "name": "assignee_type",
             "in": "query",
@@ -295,8 +300,7 @@
               "me",
               "unassigned",
               "all"
-            ],
-            "required": true
+            ]
           },
           {
             "name": "status",
@@ -306,14 +310,12 @@
               "open",
               "resolved",
               "bot"
-            ],
-            "required": true
+            ]
           },
           {
             "name": "page",
             "in": "query",
-            "type": "integer",
-            "required": true
+            "type": "integer"
           },
           {
             "name": "inbox_id",