Cleanup

[LoicPoullain]

Issue & steps

• Remove the object ValidationError and the function validate which are unused and do not bring value to the framework.
• Remove the deprecated function createHttpResponseFile and use Disk.createHttpResponseFile instead. Once done, remove the package mime from @foal/core dependencies.
• Remove the package @foal/formidable and use the @ValidateMultipartFormDataBody hook instead.
• Remove the deprecated legacy option of the functions hashPassword and verifyPassword. This option was used in very old versions of Foal when no one was using the framework.
• Remove the deprecated package @foal/ejs and the possibility to create FoalTS template engines. Only Express templates engines will be allowed (Twig, EJS, pug, etc).
• Drop the support of Node 8 and run tests on Node 12 and 14. Version 8 of Node is not maintained anymore. Uninstall pump in @foal/core, @foal/storage and @foal/aws-s3 and use the pipeline function from the standard library (added in Node 10).
• Remove the unused command foal g sub-app.
• Check if password hashing needs an update (OWASP).
• Make createApp return a promise and remove createAndInitApp. The function createAndInitApp was introduced because we needed to return a promise.

  // Before
  const app = createApp();
  const app = await createAndInitApp();
  
  // After
  const app = await createApp();

• Only allow one way to pass a custom express instance to createApp.

  // Before
  const expressInstance = express();
  const app = createApp(expressInstance);
  // OR
  const app = createApp({ expressInstance });
  
  // After
  const expressInstance = express();
  const app = createApp({ expressInstance });

This PR also resolves #710.

Breaking changes

• TypeScript 4.0 or higher is required.
• Package @foal/ejs removed. Install and use ejs directly in config: settings.templateEngine: ejs.
• Package @foal/formidable and createHttpResponseFile. TODO: write a guide to explain how to use Disk instead.
• createApp returns a promise and calls AppController.init.
• Legacy option removed in hashPassword. If you use it (very unlikely), please open an issue.
• createApp(expressInstance) -> createApp({ expressInstance }).
• foal g sub-app removed.
• validate function removed. ValidationError, isValidationError removed. Use AJV directly instead (or validation hooks).
• createService and createService do not accept a serviceManager as second parameter.
• Use Disk instead of AbstractDisk

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

Dependencies

• @foal/cli
  • commander@6.1
• @foal/jwks-rsa
  • jwks-rsa@1.9
• @foal/swagger
  • swagger-ui-dist@3.32
• @foal/typestack
  • class-transformer@03