Add support for Gmail dynamic emails

[Michael DeRazon]

Gmail has added support for dynamic emails:

https://www.blog.google/products/gmail/take-action-and-stay-up-to-date-with-dynamic-email-in-gmail/

You can see a few examples on the blog post.

It would be really good if the Jira tickets emails will be dynamic so their status is always updated when you open them in Gmail and possibly also to reply / change their status from the email (live status is more important though)