Set up PostgreSQL database configuration and enhance application structure

- Added .env.example with database connection details and JWT configuration.
- Introduced docker-compose.yml for PostgreSQL service setup with health checks.
- Created drizzle.config.ts for database schema and migration management.
- Updated nest-cli.json to include Swagger plugin configuration for API documentation.
- Enhanced package.json with new database-related scripts and dependencies.
- Implemented initial database migrations for user and token management.
- Configured application bootstrap process to load environment variables and set up Swagger.
- Added shared application configuration in configure-app.ts for consistent setup.
- Included unit tests for application configuration and Swagger setup.

test/app.e2e-spec.ts

@@ -3,6 +3,7 @@ import { INestApplication } from '@nestjs/common';
 import request from 'supertest';
 import { App } from 'supertest/types';
 import { AppModule } from './../src/app.module';
+import { configureApp } from '../src/common/configure-app';
 
 describe('AppController (e2e)', () => {
   let app: INestApplication<App>;
@@ -13,6 +14,10 @@ describe('AppController (e2e)', () => {
     }).compile();
 
     app = moduleFixture.createNestApplication();
+    configureApp(app, {
+      NODE_ENV: 'test',
+      SWAGGER_ENABLED: 'false',
+    });
     await app.init();
   });