Looking into a solution for Caldav (and possibly carddav) support

We have an existing Dovecot/Postfix/Roundcube email solution, which I was hoping to add Caldav (and carddav?) support to, with the goal of 3rd party email clients being able to keep contacts and calendars in sync (as well as having the same information in roundcube)

In doing research, I came across traces of it being considered for Dovecot at one time (https://www.dovecot.org/list/dovecot/2015-September/101996.html), and I was wondering where this went.

Specifically, https://www.dovecot.org/list/dovecot/2015-September/101997.html seemed to hint that metadata support was a prerequisite for this (mainstream as of the email), and I was wondering if this meant there was potentially a solution built on top of this.

Thank you

-- Nathan Coulson