feat: add event that handles join approval requests (#802)

* initial commit

* lint

* add type in method

* add more actions / fixes participant jid / rename event

* fixes

* more fixes

* fix typing

* change 'reject' to 'rejected'

* chore:linting

---------

Co-authored-by: Rajeh Taher <rajeh@reforward.dev>

src/Types/GroupMetadata.ts

@@ -4,6 +4,10 @@ export type GroupParticipant = (Contact & { isAdmin?: boolean, isSuperAdmin?: bo
 
 export type ParticipantAction = 'add' | 'remove' | 'promote' | 'demote'
 
+export type RequestJoinAction = 'created' | 'revoked' | 'rejected'
+
+export type RequestJoinMethod = 'invite_link' | 'linked_group_join' | 'non_admin_add' | undefined
+
 export interface GroupMetadata {
     id: string
     owner: string | undefined