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>

web/src/routes/admin/system-settings/+page.svelte

@@ -10,6 +10,7 @@
   import OAuthSettings from '$lib/components/admin-page/settings/oauth/oauth-settings.svelte';
   import PasswordLoginSettings from '$lib/components/admin-page/settings/password-login/password-login-settings.svelte';
   import ServerSettings from '$lib/components/admin-page/settings/server/server-settings.svelte';
+  import NotificationSettings from '$lib/components/admin-page/settings/notification-settings/notification-settings.svelte';
   import SettingAccordion from '$lib/components/shared-components/settings/setting-accordion.svelte';
   import StorageTemplateSettings from '$lib/components/admin-page/settings/storage-template/storage-template-settings.svelte';
   import ThemeSettings from '$lib/components/admin-page/settings/theme/theme-settings.svelte';
@@ -48,6 +49,7 @@
     | typeof ImageSettings
     | typeof TrashSettings
     | typeof NewVersionCheckSettings
+    | typeof NotificationSettings
     | typeof FFmpegSettings
     | typeof UserSettings;
 
@@ -116,6 +118,12 @@
       subtitle: 'Manage map related features and setting',
       key: 'location',
     },
+    {
+      item: NotificationSettings,
+      title: 'Notification Settings',
+      subtitle: 'Manage notification settings, including email',
+      key: 'notifications',
+    },
     {
       item: OAuthSettings,
       title: 'OAuth Authentication',