Investigate issue 236 on Windows CI

[quinnj]

Summary

• Add a focused Windows diagnostic workflow for EXCEPTION_ACCESS_VIOLATION error in ma_stmt_execute_generate_simple_request #236.
• Run MySQL 8.4 on Windows runners without Docker.
• Exercise 31/32/33/34/64/128 prepared-statement parameter cases for UInt64, Int64, random UInt64, constant queries, table queries, and unbuffered fetches.
• Matrix default MariaDB_Connector_C_jll versus 3.3.9 to test the binary-isolation question.

Notes

This is a diagnostic PR, not a proposed final fix. The goal is to collect Windows CI evidence for the access violation reported in #236.

Local checks

• git diff --check
• julia --startup-file=no -e 'Meta.parseall(read("test/issue236_windows.jl", String)); println("parseall ok")'\n- Ran test/issue236_windows.jl locally against Docker MySQL 8.4.9 with default JLL 3.4.8+0\n- Ran test/issue236_windows.jl locally against Docker MySQL 8.4.9 with JLL 3.3.9+0\n\nCo-authored by Codex

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.84%. Comparing base (9db9900) to head (6e1bffa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   69.82%   69.84%   +0.02%     
==========================================
  Files          10       10              
  Lines        1183     1184       +1     
==========================================
+ Hits          826      827       +1     
  Misses        357      357              

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