feat: improve the LDAP implementation (#615)

* feat(logging): add PV_LOG_LEVEL environment variable to set backend log level

* feat(ldap): Adding a more verbose logging output to debug LDAP issues

* fix(ldap): fixed user logins with special characters within the users dn by switching to ldapts

* feat(ldap): made the member of and email attribute names configurable

* fix(ldap): properly handle email like usernames and fixing #601

* Revert "fix: disable email login if ldap is enabled"

This reverts commit d9cfe697d6.

* feat(ldap): disable the ability for a user to change his email when it's a LDAP user

* feat(ldap): relaxed username pattern by allowing the @ character in usernames

backend/src/app.controller.ts

@@ -4,7 +4,7 @@ import { PrismaService } from "./prisma/prisma.service";
 
 @Controller("/")
 export class AppController {
-  constructor(private prismaService: PrismaService) {}
+  constructor(private prismaService: PrismaService) { }
 
   @Get("health")
   async health(@Res({ passthrough: true }) res: Response) {