Add toggle selector and event to render

[ThanhKhoaIT]

We can click/hover to render from Client

For examples applied cases

• Load more items
• Load detail of information
• Load for rarely used data

Issue: #75

[nikolalsvk]

Thanks for PR @ThanhKhoaIT!

It looks excellent, I would only add more text to the README about the usage :)

[ThanhKhoaIT]

Thanks for replied, @nikolalsvk ❗️❗️❗️ I have update README

[preetsethi]

Hey guys, I saw the attached issue / this PR, realized it was exactly what I was looking for! So thanks to both @ThanhKhoaIT and @nikolalsvk

I've been testing the changes and just wanted to share some findings:

• In it's current form, the toggle feature does not work when RenderAsync.config.turbolinks = true. The conditional for turbolinks fires first and triggers the partial to render, regardless of the toggle config. This is an easy fix by changing the conditional to <% if turbolinks && !toggle %>.
• It should be noted that if you're using render_async with toggle inside of a loop, the selector must be named accordingly. This is obvious but might be worth mentioning in the README.

Otherwise, this is freaking awesome. Seriously, thank you both for your work!