Add Pothos-generated User GraphQL schema and resolver

This commit adds the Pothos-generated User GraphQL schema and resolver. The schema is defined in the `src/graphql/graphql.schema.ts` file, and the resolver is defined in the `src/graphql/graphql.resolver.ts` file. The schema includes the `User` object type with fields for `id`, `name`, and `email`. The resolver includes a query field `users` that resolves to fetch all users from the Prisma database.

src/prisma/prisma.module.ts

@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from './prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}

src/prisma/prisma.service.ts

@@ -1,15 +1,16 @@
-import { Injectable, OnModuleInit, INestApplication } from '@nestjs/common';
+import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
 import { PrismaClient } from '@prisma/client';
 
 @Injectable()
-export class PrismaService extends PrismaClient implements OnModuleInit {
+export class PrismaService
+  extends PrismaClient
+  implements OnModuleInit, OnModuleDestroy
+{
   async onModuleInit() {
     await this.$connect();
   }
 
-  async enableShutdownHooks(app: INestApplication) {
-    this.$on('beforeExit', async () => {
-      await app.close();
-    });
+  async onModuleDestroy() {
+    await this.$disconnect();
   }
 }