Allow sharing of Calendar events

Is your feature request related to a problem? Please describe.

As a user in a group I would like to share an event added to Calendar on the NextCloud instance to alert others & discuss if need be. As you can see there is no calendar item Share Calendar Event in the menu:

Describe the solution you'd like

I would like an item in the Attachment menu that allows attached events from the Calendar.
The item would say Share from Calendar and after selecting would insert an item in the Talk thread that links to the event such as:

https://my.next.cloud/apps/calendar/dayGridMonth/2023-04-01/edit/sidebar/L3JlbW90ZS5waH...

Additional context

There is the ability to start a Talk room from an event via the Calendar app

This in entirely different flow and creates a new room, rather than linking from the Talk thread.

Start by inspecting the Talk Attachment menu and comparing it with the existing Calendar flow that starts a Talk room. Trace how an event link could be selected from Calendar and represented in a Talk thread. Done means the Attachment menu offers “Share from Calendar” and inserts a link to the selected event without creating a new room.