Improve separation of concerns by keeping model-related functionality in the model module
while maintaining client-specific functionality in the client module.
- Move MessageAggregator class from spring-ai-client-chat to spring-ai-model module
- Create new ChatClientMessageAggregator in spring-ai-client-chat module to handle client-specific aggregation
- Extract client-specific aggregation logic from MessageAggregator to ChatClientMessageAggregator
- Update references in advisor classes to use the new ChatClientMessageAggregator
Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>
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