[x] Give default values for GraphQL input fields wherever necessary.
[x] Rename Mutation.setInvitability to Mutation.setPublicity because "invitability" isn't a word. Also, use the word "publicity" in place of "invitability" throughout the repo.
[x] Instead of calling them poll titles, call them poll questions.
[x] Instead of using throw UnauthorizedException, return results (e.g., state that the message was an invalid broadcast).
Query.searchGroupChatUsers.inputfields wherever necessary.Mutation.setInvitabilitytoMutation.setPublicitybecause "invitability" isn't a word. Also, use the word "publicity" in place of "invitability" throughout the repo.throw UnauthorizedException, return results (e.g., state that the message was an invalid broadcast).