Add support for OpenSearch 2.x

Changes

Backward Compatibility Breaks

• Bump PHP minimum version to PHP 8.3
• Kununu\Elasticsearch\IndexManagement\IndexManager was removed
  • Use Kununu\Elasticsearch\IndexManagement\Elasticsearch\IndexManager instead, for Elasticsearch
  • Use Kununu\Elasticsearch\IndexManagement\OpenSearch\IndexManager for OpenSearch
• All non-abstract classes from Kununu\Elasticsearch\Query namespace are now final
• All non-abstract classes from Kununu\Elasticsearch\Result namespace are now final
• QueryInterface::sort method signature was changed (see bugfixes section below)

Bugfixes

• Implementation of QueryInterface::sort method was redefining the signature:
  • Now the interface supports the proper 3 arguments (which were even mentioned in the documentation)

Added

• Support for OpenSearch 2.x
  • Index Manager
  • Repository

Improvements

• For the library internal development:
  • Bump PHPUnit version to 11.5
  • Formatted all code according to the latest release of kununu/scripts
  • Introduce code quality tools: Rector and PHPStan
    • Add those tools to the CI pipeline
    • Bump code to PHP 8.3 standards (e.g. typed constants)
    • Analyse and fix errors reported by Rector and PHPStan
  • Replace deprecated SonarCloud action with latest SonarQube Scan action to perform Sonar checks

Deprecated

• Kununu\Elasticsearch\Repository\Repository is deprecated
  • It should be replaced by Kununu\Elasticsearch\Repository\Elasticsearch\Repository if being used isolated
  • Or child classes should extend from Kununu\Elasticsearch\Repository\Elasticsearch\AbstractElasticsearchRepository instead