Provide option to enable emojis in the content

[pradeep910]

The plugin removes the emojis support by default. While this is good for website optimization and core web vitals. That also blocks emojis being rendered.
https://github.com/wpcomvip/rtcamp2/blob/master/plugins/rt-scripts-optimizer/rt-scripts-optimizer.php#L293-L325

• Provide an option to enable the emojis so that displays well if content has emojis.

[mangesh]

@pradeep910 This URL given in the issue is giving me 404 error. Can you please add me to that repo if possible?