[FEATURE] Support LDAP Authentication

### Describe the feature

This feature enables an application or system to authenticate users using an LDAP (Lightweight Directory Access Protocol) directory service, such as Active Directory or OpenLDAP. By integrating LDAP authentication, users can log in with their existing directory credentials, simplifying access management and enhancing security through centralized user management.

### Motivation

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### Describe the solution

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### Additional context

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The issue names no files, tests, or entry points and does not specify a solution. First clarify the LDAP integration scope, supported directory services, configuration, and authentication flow; then locate the existing authentication entry points and tests. Done should include an agreed design, implementation coverage, and verification for the supported LDAP scenarios.

Written by the indexing model from the issue text.