add list-calendars command

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

Rebase and delete URI suggestion part

Invite to use occ dav:list-calendars instead

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Fix autoload

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Use injection & test everything

And rebase

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Add test for ListCalendars and refactoring

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Fix indentation

Signed-off-by: Thomas Citharel <tcit@tcit.fr>