feat: Add hCaptcha for public forms (#4017)

- added hCaptcha based verification for chatwoot signups

Co-authored-by: Sojan <sojan@pepalo.com>

db/migrate/20220218120357_add_h_captcha_key.rb

@@ -0,0 +1,5 @@
+class AddHCaptchaKey < ActiveRecord::Migration[6.1]
+  def change
+    ConfigLoader.new.process
+  end
+end