Conversation settings parity

Similar to https://github.com/nextcloud/talk-android/issues/1028 to be inline with current conversation settings.

Ultimate list:

User

• Chat notification level
• Call notifications https://github.com/nextcloud/spreed/pull/6338

Danger zone

• Leave conversation

Moderators

• Description
• #2134
• #2133
• Resend invitations
• Open conversation to registered users https://github.com/nextcloud/talk-android/issues/1028
• Open conversation to guest app users (only when guest app is installed) https://github.com/nextcloud/talk-android/issues/1028
• Lock conversation https://github.com/nextcloud/talk-android/issues/1028
• #2135
• Lobby timer
• Enable SIP

Danger zone

• Delete conversation
• Delete chat messages

Android only

• "Important conversation" - move to the end of the list (before danger zone) and add note that its not shared cross device
• fix wording of "specially crafted link"

As discussed last week.

Feel free to create dedicated issues for each missing checkbox and then close this meta ticket.

Start by comparing the current Android conversation settings with the linked talk-android issue and review each unchecked item in this meta ticket. Use the listed settings and linked issues to split the work into dedicated issues; the meta ticket is complete when all remaining parity items are addressed or tracked separately.