Add schedule api (#60)

apps/web/prisma/migrations/20240820093529_add_schedule/migration.sql

@@ -0,0 +1,5 @@
+-- AlterEnum
+ALTER TYPE "EmailStatus" ADD VALUE 'SCHEDULED';
+
+-- AlterTable
+ALTER TABLE "Email" ADD COLUMN     "scheduledAt" TIMESTAMP(3);

apps/web/prisma/migrations/20240820093931_add_cancelled/migration.sql

@@ -0,0 +1,2 @@
+-- AlterEnum
+ALTER TYPE "EmailStatus" ADD VALUE 'CANCELLED';