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/prisma/prisma.service.ts

@@ -1,9 +1,11 @@
-import { Injectable } from "@nestjs/common";
+import { Injectable, Logger } from "@nestjs/common";
 import { PrismaClient } from "@prisma/client";
 import { DATABASE_URL } from "../constants";
 
 @Injectable()
 export class PrismaService extends PrismaClient {
+  private readonly logger = new Logger(PrismaService.name);
+
   constructor() {
     super({
       datasources: {
@@ -12,6 +14,6 @@ export class PrismaService extends PrismaClient {
         },
       },
     });
-    super.$connect().then(() => console.info("Connected to the database"));
+    super.$connect().then(() => this.logger.log("Connected to the database"));
   }
 }