add stdio_read_timeout for create_mcp_server_session

[Septa2112]

Why are these changes needed?

If no timeout here, the program will hang when it fails to create the MCP server.

Related issue number

Closes #6031

Checks

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

[Septa2112]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.77%. Comparing base (0bec835) to head (2363745).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../autogen-ext/src/autogen_ext/tools/mcp/_session.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6080   +/-   ##
=======================================
  Coverage   76.77%   76.77%           
=======================================
  Files         191      191           
  Lines       13240    13241    +1     
=======================================
+ Hits        10165    10166    +1     
  Misses       3075     3075           

Flag	Coverage Δ
unittests	76.77% <66.66%> (+<0.01%)	⬆️

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