chore: Generate test data for bulk insertion (#11229)

Co-authored-by: Vishnu Narayanan <vishnu@chatwoot.com>
Co-authored-by: Sojan <sojan@pepalo.com>
Co-authored-by: tds-1 <tanmay@qoala.id>
Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

lib/test_data/inbox_creator.rb

@@ -0,0 +1,12 @@
+class TestData::InboxCreator
+  def self.create_for(account)
+    Array.new(TestData::Constants::INBOXES_PER_ACCOUNT) do
+      channel = Channel::Api.create!(account: account)
+      Inbox.create!(
+        account_id: account.id,
+        name: "API Inbox #{SecureRandom.hex(4)}",
+        channel: channel
+      )
+    end
+  end
+end