Deprecate module for ai 1.2.x

Problem/Motivation

The AI Translated text extractor plugins have been revamped in the AI module in branch 1.2.x.
See ✨ Add text extractor plugins for image and link field types Active .
As part of this effort, the asymmetric translation of Layout Builder has been included in the main LbTextExtractor plugin, to avoid having multiple plugins conflicting with each other for the same field type.

This means this module will no longer be needed when using AI 1.2.x.

Proposed resolution

* Update composer.json to indicate this module requires ai 1.0.x or 1.1.x, but not 1.2.x
E.g. `"drupal/ai": "~1.0.0 || ~1.1.0"`
* Update the project description, to indicate the module is no longer needed for AI 1.2.x onwards, since it has been included into the main AI package.