create wholeMessage resolver

+import { prisma, isAuthenticated } from "../../../utils";
+
+export default () => {
+  Mutation: {
+    wholeMessage: async (_, args, { request }) => {
+      isAuthenticated(request);
+      const { user } = request;
+      const { message, roomId } = args;
+
+      let room = await prisma.room.findOne({
+        where: {
+          id: roomId,
+        },
+      });
+
+      let messageObj = await prisma.message.create({
+        data: {
+          text: message,
+          sender: {
+            connect: {
+              id: user.id,
+            },
+          },
+        },
+      });
+
+      if (room !== undefined || room !== null) {
+        // 방이 존재하는 경우
+        room = await prisma.room.update({
+          where: {
+            id: roomId,
+          },
+          data: {
+            messages: {
+              connect: {
+                id: messageObj.id,
+              },
+            },
+          },
+        });
+      }
+      return messageObj;
+    };
+  }
+};