Issue #3536887 by ajv009, svendecabooter: Move TextExtractor service to AI core

Alphons Jaimonrequested to merge
issue/ai-3536887:3536887-move-textextractor-service-2.0.x into 2.0.x

Introduces a new AiFieldTextExtractor plugin type in AI core that provides generic text extraction capabilities for any AI submodule. The ai_translate plugins now extend these core plugins, adding only translation-specific logic (setValue, translatable-aware shouldExtract).

Closes #3536887

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