feat(adk): add ModelOptions config for summarization middleware

[mrh997]

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✅ All modified and coverable lines are covered by tests.
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  Coverage            ?   79.75%           
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  Files               ?      146           
  Lines               ?    15805           
  Branches            ?        0           
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  Hits                ?    12606           
  Misses              ?     2222           
  Partials            ?      977           

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