Save AI Content Suggestion plugin settings inside ai_content_suggestions.settings config object
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## Summary
At the moment the settings of AI Content Suggestion plugins are splitted between 3 config objects:
- ai_content_suggestions.settings
- ai_content_suggestions.prompts
- ai_content_suggestions.tone
## Problem
Content object `ai_content_suggestions.settings` needs to have all plugin settings to avoid loading unnecessary configurations, this way the plugin instantiation could be easier as configuration will exist in the same config file.
issue