feat(arabot): add updating statistics for outreach groups

prisma/migrations/20230228200640_stat_role/migration.sql

@@ -0,0 +1,10 @@
+-- CreateTable
+CREATE TABLE "StatRole" (
+    "statId" INTEGER NOT NULL,
+    "roleId" TEXT NOT NULL,
+
+    CONSTRAINT "StatRole_pkey" PRIMARY KEY ("statId")
+);
+
+-- AddForeignKey
+ALTER TABLE "StatRole" ADD CONSTRAINT "StatRole_statId_fkey" FOREIGN KEY ("statId") REFERENCES "Stat"("id") ON DELETE RESTRICT ON UPDATE CASCADE;