Feature: Introduce bots (#545)

Co-authored-by: Pranav Raj S <pranavrajs@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

db/migrate/20200222143100_create_agent_bots.rb

@@ -0,0 +1,12 @@
+class CreateAgentBots < ActiveRecord::Migration[6.0]
+  def change
+    create_table :agent_bots do |t|
+      t.string :name
+      t.string :description
+      t.string :outgoing_url
+      t.string :auth_token, unique: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20200222143259_create_agent_bot_inboxes.rb

@@ -0,0 +1,11 @@
+class CreateAgentBotInboxes < ActiveRecord::Migration[6.0]
+  def change
+    create_table :agent_bot_inboxes do |t|
+      t.integer :inbox_id
+      t.integer :agent_bot_id
+      t.integer :status, default: 0
+
+      t.timestamps
+    end
+  end
+end