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

frontend/src/i18n/translations/en-US.ts

@@ -50,7 +50,6 @@ export default {
   "signIn.oauth.microsoft": "Microsoft",
   "signIn.oauth.discord": "Discord",
   "signIn.oauth.oidc": "OpenID",
-  "signIn.error.invalid-username": "Invalid username",
 
   // END /auth/signin
 
@@ -586,6 +585,10 @@ export default {
   "admin.config.ldap.search-query.description": "The user query will be used to search the 'User base' for the LDAP user. %username% can be used as the placeholder for the user given input.",
   "admin.config.ldap.admin-groups": "Admin group",
   "admin.config.ldap.admin-groups.description": "Group required for administrative access.",
+  "admin.config.ldap.field-name-member-of": "User groups attribute name",
+  "admin.config.ldap.field-name-member-of.description": "LDAP attribute name for the groups, an user is a member of. This is used when checking for the admin group.",
+  "admin.config.ldap.field-name-email": "User email attribute name",
+  "admin.config.ldap.field-name-email.description": "LDAP attribute name for the email of an user.",
 
   // 404
   "404.description": "Oops this page doesn't exist.",