Add highlight methods to search and search builder

[alexander-schranz]

This will add the core highlight methods for the highlighting search results:

$result = $this->engine->createSearchBuilder('blog')
    ->addFilter(new Condition\SearchCondition('Search Term'))
    ->highlight(
        fields: ['title', 'description'],
        preTag: '<mark>',
        postTag: '</mark>',
    )

See also #343

TODO implementation

• Add highlight methods to search and search builder #348
• Add testSearchConditionWithHighlight to AbstractSearcherTestCase: Add highlight implementation for memory adapter #351
• Memory: Add highlight implementation for memory adapter #351
• Elasticsearch Add highlight implementation for elasticsearch and opensearch adapter #490
• Opensearch Add highlight implementation for elasticsearch and opensearch adapter #490
• Meilisearch Add highlight implementation for meilisearch adapter #488
• Algolia Add highlight implementation for algolia adapter #489
• Redisearch: Add highlight implementation for redisearch adapter #355 ⚠️ not supported skipped in Skip testSearchConditionWithHighlight as not supported by RediSearch #492
• Typesense: Add highlight implementation for typesense adapter #354
• Solr: Add highlight implementation for solr adapter #353
• Loupe Add Highlighting for Loupe #487

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fixes #343

[alexander-schranz]

TODO need to check why I exposed this in #483