LDAP authentication (#374)

# Description

This will resolve part of #144
The ticket can be merged once the stretch goals are reached as well.

A new iteration on the changes prototyped in #341

This iteration will include:

* A closer resemblance to the ticket requirements - using a list of authenticators
* Non-usage of LDAP for inter-node authentication (basic authentication instead)
* Erroring out if both TLS auth and LDAP auth are configured

## Follow-up Work

* Interconnection with an OPA authorization config, if provided (former stretch goal)
* Adding ldaps:// support (former stretch goal)
* Druid does not like anonymous LDAP access (without bind credentials). I have not found a way to configure it. This however, seems to be a usecase we want to support generally.

CHANGELOG.md

@@ -6,6 +6,18 @@ All notable changes to this project will be documented in this file.
 
 ### Added
 
+- Add support for non-TLS LDAP authentication. ([#374])
+
+### Changed
+
+- Upgrade to `operator-rs` `0.31.0` ([#374])
+
+[#374]: https://github.com/stackabletech/druid-operator/pull/374
+
+## [23.1.0] - 2023-01-23
+
+### Added
+
 - BREAKING: Support for TLS encryption (activated per default -> port changes) and TLS authentication ([#333])
 - Use emptyDir for segment cache on historicals ([#342])