message registry buffer size limit #5582

[rysweet]

Why are these changes needed?

helps ensure that we don't buffer messages that are too large

Related issue number

Closes #5582

Checks

• [x ] I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• [ x] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [x ] I've made sure all auto checks have passed.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 103 lines in your changes missing coverage. Please review.

Project coverage is 64.01%. Comparing base (2f43005) to head (72a24b2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...eway.Grpc/Services/Orleans/MessageRegistryQueue.cs	0.00%	68 Missing and 11 partials ⚠️
...eway.Grpc/Services/Orleans/MessageRegistryGrain.cs	0.00%	24 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5603       +/-   ##
===========================================
- Coverage   75.41%   64.01%   -11.41%     
===========================================
  Files         171      131       -40     
  Lines       10467     4863     -5604     
  Branches        0      242      +242     
===========================================
- Hits         7894     3113     -4781     
+ Misses       2573     1561     -1012     
- Partials        0      189      +189     

Flag	Coverage Δ
unittests	64.01% <0.00%> (-11.41%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.