feat(adk): support user message filter for summarization

[mrh997]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.92%. Comparing base (e2eea8e) to head (4f02a22).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #904      +/-   ##
==========================================
+ Coverage   81.90%   81.92%   +0.01%     
==========================================
  Files         146      146              
  Lines       16057    16063       +6     
==========================================
+ Hits        13152    13160       +8     
+ Misses       1967     1965       -2     
  Partials      938      938              

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