Add email queue (#1)

* Add pgboss queue support

* Implement queue for sending emails

* Add migrations

apps/web/prisma/migrations/20240510004745_add_queue_enum/migration.sql

@@ -0,0 +1,5 @@
+-- AlterEnum
+ALTER TYPE "EmailStatus" ADD VALUE 'QUEUED';
+
+-- AlterTable
+ALTER TABLE "Email" ADD COLUMN     "attachments" TEXT;