Swarm: refactor avatar generation

• support conversation Ids and account Ids
• preliminary support new group avatar design
• replace update functions with observation
• divide out avatar component responsibilities
• avoid excess loads

added swarm label

added sprintin progress label

changed the description

added sprintto review label and removed sprintin progress label

mentioned in commit 4bda3306

mentioned in commit 92a3d032

mentioned in commit 4aef4a69

mentioned in commit 26c922da

mentioned in commit 50490dea

marked the checklist item support conversation Ids and account Ids as completed

marked the checklist item replace update functions with observation as completed

marked the checklist item divide out avatar component responsibilities as completed

marked the checklist item avoid excess loads as completed

removed sprintto review label

changed the description

closed