Refactor backend folder structure (#4505)

* Refactor backend folder structure

Co-authored-by: Charles Bochet <charles@twenty.com>

* fix tests

* fix

* move yoga hooks

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/integrations/email/email-sender.service.ts

@@ -0,0 +1,16 @@
+import { Inject, Injectable } from '@nestjs/common';
+
+import { SendMailOptions } from 'nodemailer';
+
+import { EmailDriver } from 'src/engine/integrations/email/drivers/interfaces/email-driver.interface';
+
+import { EMAIL_DRIVER } from 'src/engine/integrations/email/email.constants';
+
+@Injectable()
+export class EmailSenderService implements EmailDriver {
+  constructor(@Inject(EMAIL_DRIVER) private driver: EmailDriver) {}
+
+  async send(sendMailOptions: SendMailOptions): Promise<void> {
+    await this.driver.send(sendMailOptions);
+  }
+}