feat(server): email notifications (#8447)

* feat(server): add `react-mail` as mail template engine and `nodemailer`

* feat(server): add `smtp` related configs to `SystemConfig`

* feat(web): add page for SMTP settings

* feat(server): add `react-email.adapter`

This adapter render the React-Email into HTML and plain/text email.
The output is set as the body of the email.

* feat(server): add `MailRepository` and `MailService`

Allow to use the NestJS-modules-mailer module to send SMTP emails.
This is the base transport for the `NotificationRepository`

* feat(server): register the job dispatcher and Job for async email

This allows to queue email sending jobs for the `EmailService`.

* feat(server): add `NotificationRepository` and `NotificationService`

This act as a middleware to properly route the notification to the right transport.
As POC I've only implemented a simple SMTP transport.

* feat(server): add `welcome` email template

* feat(server): add the first notification on `createUser` in `UserService`

This trigger an event for the `NotificationRepository` that once processes
by using the global config and per-user config will carry the payload to the right notification transport.

* chore: clean up

* chore: clean up web

* fix: type errors"

* fix package lock

* fix mail sending, option to ignore certs

* chore: open api

* chore: clean up

* remove unused import

* feat: email feature flag

* chore: remove unused interface

* small styling

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>
Co-authored-by: Daniel Dietzler <mail@ddietzler.dev>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

server/src/interfaces/notification.interface.ts

@@ -0,0 +1,44 @@
+export const INotificationRepository = 'INotificationRepository';
+
+export type SendEmailOptions = {
+  from: string;
+  to: string;
+  replyTo?: string;
+  subject: string;
+  html: string;
+  text: string;
+  smtp: SmtpOptions;
+};
+
+export type SmtpOptions = {
+  host: string;
+  port?: number;
+  username?: string;
+  password?: string;
+  ignoreCert?: boolean;
+};
+
+export enum EmailTemplate {
+  WELCOME = 'welcome',
+  RESET_PASSWORD = 'reset-password',
+}
+
+export interface WelcomeEmailProps {
+  baseUrl: string;
+  displayName: string;
+  username: string;
+  password?: string;
+}
+
+export type EmailRenderRequest = { template: EmailTemplate.WELCOME; data: WelcomeEmailProps };
+
+export type SendEmailResponse = {
+  messageId: string;
+  response: any;
+};
+
+export interface INotificationRepository {
+  renderEmail(request: EmailRenderRequest): { html: string; text: string };
+  sendEmail(options: SendEmailOptions): Promise<SendEmailResponse>;
+  verifySmtp(options: SmtpOptions): Promise<true>;
+}