fix(linky): handle the double quote character in email addresses

Handle the double quote character as part of the domain in email addresses

Closes #8945
So I think what you are saying is that since `"Pete Bacon Darwin"@example.com` is a valid email (even with unencoded double quotes) then this ought to be allowed as a value to be put into an anchor element's `href` attribute, and that when serializing this attribute we should only be HTML encoding it.

I am good with that.  Let's go with this and then put out a `PR Plz` issue for better improving the email/URL identification in linky - perhaps looking at something like https://github.com/FogCreek/email-addresses

I'll merge.