build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

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

src/types/participant.model.ts

@@ -0,0 +1,39 @@
+import { Actor } from "./actor";
+import type { IActor } from "./actor";
+import { EventModel } from "./event.model";
+import type { IEvent } from "./event.model";
+import { ParticipantRole } from "./enums";
+
+export interface IParticipant {
+  id?: string;
+  role: ParticipantRole;
+  actor: IActor;
+  event: IEvent;
+  metadata: { cancellationToken?: string; message?: string };
+  insertedAt?: Date;
+}
+
+export class Participant implements IParticipant {
+  id?: string;
+
+  event!: IEvent;
+
+  actor!: IActor;
+
+  role: ParticipantRole = ParticipantRole.NOT_APPROVED;
+
+  metadata = {};
+
+  insertedAt?: Date;
+
+  constructor(hash?: IParticipant) {
+    if (!hash) return;
+
+    this.id = hash.id;
+    this.event = new EventModel(hash.event);
+    this.actor = new Actor(hash.actor);
+    this.role = hash.role;
+    this.metadata = hash.metadata;
+    this.insertedAt = hash.insertedAt;
+  }
+}