chore: Add Message API, cleanup conversation_id param (#2249)

swagger/parameters/account_id.yml

@@ -3,4 +3,4 @@ name: account_id
 schema:
   type: integer
 required: true
-description: Numeric ID of the account
+description: The numeric ID of the account

swagger/parameters/conversation_id.yml

@@ -0,0 +1,6 @@
+in: path
+name: conversation_id
+schema:
+  type: integer
+required: true
+description: The numeric ID of the conversation

swagger/parameters/index.yml

@@ -3,3 +3,9 @@ account_id:
 
 team_id:
   $ref: ./team_id.yml
+
+conversation_id:
+  $ref: ./conversation_id.yml
+
+message_id:
+  $ref: ./message_id.yml

swagger/parameters/message_id.yml

@@ -0,0 +1,6 @@
+in: path
+name: message_id
+schema:
+  type: integer
+required: true
+description: The numeric ID of the message