Add PROC_THREAD_ATTRIBUTE_CHILD_PROCESS_POLICY

[jborean93]

Add support for setting PROC_THREAD_ATTRIBUTE_CHILD_PROCESS_POLICY as an extended StartupInfo attribute. This policy can be used to restrict the ability for the child process to start its own processes.

[codecov]

Codecov Report

Attention: Patch coverage is 93.82716% with 5 lines in your changes missing coverage. Please review.

Project coverage is 88.25%. Comparing base (13d6772) to head (abb7ed2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ProcessEx/Commands/StartupInfo.cs	93.67%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   87.01%   88.25%   +1.23%     
==========================================
  Files          26       26              
  Lines        1371     1856     +485     
  Branches      217      218       +1     
==========================================
+ Hits         1193     1638     +445     
- Misses        112      154      +42     
+ Partials       66       64       -2     

Flag	Coverage Δ
PS_5.1_x64_Windows	84.93% <93.82%> (+1.58%)	⬆️
PS_5.1_x86_Windows	87.75% <93.82%> (+1.25%)	⬆️
PS_7.2_x64_Windows	84.91% <93.82%> (+1.54%)	⬆️
PS_7.3_x64_Windows	84.91% <93.82%> (+1.54%)	⬆️
PS_7.4_x64_Windows	84.91% <93.82%> (+1.54%)	⬆️
PS_7.4_x86_Windows	87.74% <93.82%> (+1.21%)	⬆️

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