title: How to add dynamic input fields in custom plugin settings api
body: <p>Basically i am building a plugin whose main purpose is to take requirements from users.
  I want to add options in settings of plugin that admin can choose input types like WP Forms plugin and selected inputs should be shown on front end page in the shape of query form.
  I can add single input through settings api but unable to add multiple input fields.
  Please have a look and suggest me solution of this problem as working on this from last 3 days but unable to add dynamic input fields.</p>