feat(notifications): add missing notifications when an user registers to an event

Closes #1344

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/types/activity.model.ts

@@ -3,6 +3,7 @@ import { IMember } from "./actor/member.model";
 import {
   ActivityDiscussionSubject,
   ActivityEventCommentSubject,
+  ActivityEventParticipantSubject,
   ActivityEventSubject,
   ActivityGroupSubject,
   ActivityMemberSubject,
@@ -21,7 +22,8 @@ export type ActivitySubject =
   | ActivityResourceSubject
   | ActivityDiscussionSubject
   | ActivityGroupSubject
-  | ActivityEventCommentSubject;
+  | ActivityEventCommentSubject
+  | ActivityEventParticipantSubject;
 
 export interface IActivity {
   id: string;

js/src/types/enums.ts

@@ -200,6 +200,10 @@ export enum ActivityEventCommentSubject {
   COMMENT_POSTED = "comment_posted",
 }
 
+export enum ActivityEventParticipantSubject {
+  EVENT_NEW_PARTICIPATION = "event_new_participation",
+}
+
 export enum ActivityPostSubject {
   POST_CREATED = "post_created",
   POST_UPDATED = "post_updated",