Display Google Meet/Hangout data if available

Note

This patch will not work until libkgapi!31 (merged) is merged.

Feel free to undraft this MR if and when the relevant libkgapi patch has been merged.

Summary

This MR aims to solve Bug-458655 by displaying a clickable Google Meet/Hangout link on events that supply one.

Test Plan

1. Ensure your local libkgapi has libkgapi!31 (merged) applied.
2. Connect a new Google groupware.
3. Create an event in said Google Calendar which contains an invitation to a Google Meet/Hangout.
4. Have Kalendar sync the events.

You should observe that the link to the Google Meet/Hangout is displayed below the organizer in the detailed event view.