feat: add functional authentication

api/stores/event-store/events/auditor.ts

@@ -0,0 +1,21 @@
+import z from "zod";
+
+export const AuditorSchema = z.object({
+  auditor: z.union([
+    z.object({
+      type: z.literal("system"),
+    }),
+    z.object({
+      type: z.literal("account"),
+      accountId: z.string(),
+    }),
+  ]),
+});
+
+export const systemAuditor: Auditor = {
+  auditor: {
+    type: "system",
+  },
+};
+
+export type Auditor = z.infer<typeof AuditorSchema>;