Chore: Inbox Members API improvements (#3008)

- New Inbox Member APIs
- Return JSON errors for Platform APIs

config/routes.rb

@@ -104,7 +104,12 @@ Rails.application.routes.draw do
             post :set_agent_bot, on: :member
             delete :avatar, on: :member
           end
-          resources :inbox_members, only: [:create, :show], param: :inbox_id
+          resources :inbox_members, only: [:create, :show], param: :inbox_id do
+            collection do
+              delete :destroy
+              patch :update
+            end
+          end
           resources :labels, only: [:index, :show, :create, :update, :destroy]
 
           resources :notifications, only: [:index, :update] do