chore: Add cache to improve widget performance (#11163)

- Add dynamic importing for routes.
- Added caching for `campaign`, `articles` and `inbox_members` API end
points.

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/builders/contact_inbox_builder.rb

@@ -12,11 +12,50 @@ class ContactInboxBuilder
   private
 
   def generate_source_id
-    ContactInbox::SourceIdService.new(
-      contact: @contact,
-      channel_type: @inbox.channel_type,
-      medium: @inbox.channel.try(:medium)
-    ).generate
+    case @inbox.channel_type
+    when 'Channel::TwilioSms'
+      twilio_source_id
+    when 'Channel::Whatsapp'
+      wa_source_id
+    when 'Channel::Email'
+      email_source_id
+    when 'Channel::Sms'
+      phone_source_id
+    when 'Channel::Api', 'Channel::WebWidget'
+      SecureRandom.uuid
+    else
+      raise "Unsupported operation for this channel: #{@inbox.channel_type}"
+    end
+  end
+
+  def email_source_id
+    raise ActionController::ParameterMissing, 'contact email' unless @contact.email
+
+    @contact.email
+  end
+
+  def phone_source_id
+    raise ActionController::ParameterMissing, 'contact phone number' unless @contact.phone_number
+
+    @contact.phone_number
+  end
+
+  def wa_source_id
+    raise ActionController::ParameterMissing, 'contact phone number' unless @contact.phone_number
+
+    # whatsapp doesn't want the + in e164 format
+    @contact.phone_number.delete('+').to_s
+  end
+
+  def twilio_source_id
+    raise ActionController::ParameterMissing, 'contact phone number' unless @contact.phone_number
+
+    case @inbox.channel.medium
+    when 'sms'
+      @contact.phone_number
+    when 'whatsapp'
+      "whatsapp:#{@contact.phone_number}"
+    end
   end
 
   def create_contact_inbox
@@ -52,7 +91,7 @@ class ContactInboxBuilder
 
   def new_source_id
     if @inbox.whatsapp? || @inbox.sms? || @inbox.twilio?
-      "#{@source_id}#{rand(100)}"
+      "whatsapp:#{@source_id}#{rand(100)}"
     else
       "#{rand(10)}#{@source_id}"
     end