feat: Unify context Summarization

[Saedbhati]

Description

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fixes #3374

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch unify_summarization

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[fengju0213]

hi @Saedbhati i noticed that the prompt in the toolkit is not yet standardized，when you finish it ,you can reopen the pr

[hesamsheikh]

Hey @Saedbhati

Thanks for the PR. I'm worried this PR doesn't address the core issue that was proposed in #3374 which was unifying the three summarizations under a common backend rather than distributed approaches. I also believe the existing MessageSummarizer class is designed to generate structured JSON summaries of individual messages so adding the assummarize method to it doesn't really align with its purpose. To truly unify, we need a shared backend that all three approaches delegate to (if possible).

[hesamsheikh]

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