Import Lemonldap-NG Patroni backend changes

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Pull request overview

This PR imports Lemonldap-NG Patroni backend changes that significantly enhance the resilience and reliability of PostgreSQL cluster connections through the Patroni API. The changes replace the simple knownMappings cache with a comprehensive patroniCache system that includes circuit breaker functionality, leader caching with TTL, split-brain detection, and health state validation.

Key changes:

• Implements circuit breaker pattern to avoid hammering failing Patroni APIs
• Adds configurable leader caching with TTL support (default 60s)
• Adds split-brain detection and enhanced validation (leader state, required fields)
• Refactors DSN building logic into a dedicated _buildDataSource function
• Updates documentation with resilience features and configuration examples

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
lib/Apache/Session/Browseable/Store/Patroni.pm	Core implementation: replaces knownMappings with patroniCache, adds circuit breaker, leader validation, and new helper methods (_useCachedLeader, _buildDataSource)
lib/Apache/Session/Browseable/Patroni.pm	Updates documentation to fix spelling error, correct module examples, and document new resilience features with configuration parameters
t/Apache-Session-Browseable-Store-Patroni.t	Comprehensive new test file (589 lines, 34 tests) covering cache behavior, circuit breaker, leader validation, split-brain detection, and mocked HTTP scenarios
Build.PL	Adds LWP::Protocol::PSGI test dependency and bumps distribution version to 1.3.18
.github/workflows/ci.yml	Updates CI to install liblwp-protocol-psgi-perl package for testing

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