📲 Add "Important conversations" which still notify during DND

[nickvergessen]

• API feat(conversations): Add "Important conversations" which still notify… #14738
• Frontend Support "Important conversations" in the frontend #14880
• iOS Support "Important conversations" talk-ios#2063
• Android Support "Important conversations" talk-android#4880

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• Should support marking a conversation as important and "un-important"
• UI in left sidebar on notification settings? Or in the modal, or both?
  • Both
• How should the UI look on mobile (Android has it in conversation info atm)
  • Both
• Should it also bypass phones DND?
  • Not by default
  • Future opt-in can be added if requested often