MWPW-162020: Add char counter to RTE field

[yesil]

This PR is to be merged after #125

Resolve: https://jira.corp.adobe.com/browse/MWPW-162020

Test URLs:

• Before: https://main--mas--adobecom.hlx.live/studio.html
• After: https://mwpw-162020--mas--adobecom.hlx.live/studio.html

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	Page	Scores	Audits	Google
📱	/studio.html
🖥️	/studio.html