Add Go benchmarks for process execution patterns

[Copilot]

Implementation Plan: Go Process Benchmarks

• Study the existing C# benchmarks structure and functionality
• Create a BenchmarksGo directory for Go benchmarks
• Initialize Go module with appropriate dependencies
• Implement NoRedirection benchmark (Execute without output redirection)
• Implement Discard benchmark (Execute with output discarded)
• Implement RedirectToFile benchmark (Execute with output to file)
• Implement RedirectToPipe benchmark (Execute with piped output reading)
• Add comprehensive documentation (README) for running Go benchmarks
• Test all benchmarks to ensure they work correctly
• Update main README with references to Go benchmarks
• Fix race condition in discard benchmark
• Address feedback: Change all commands to dotnet --help
• Add exit code retrieval in all benchmarks
• Move file cleanup outside benchmark timing
• Add Windows/Unix OS detection for shell commands
• Improve OS detection using runtime.GOOS
• Add proper shell path quoting for security
• Exclude setup (TempDir and filepath.Join) from benchmark timing
• Document time unit display in benchmark output
• Simplify time units documentation
• Add comprehensive regex filtering examples for benchmark selection
• Fix Windows compatibility by quoting dot in -bench flag
• Clarify that Go has no native --export flag for benchmark results
• Recommend running filtered benchmarks to avoid stdout mixing
• Fix Windows shell redirection by converting backslashes to forward slashes
• Final verification and cleanup

Original prompt

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This section details on the original issue you should resolve

<issue_title>Implement Process benchmarks using golang</issue_title>
<issue_description>Study the C# benchmarks we have in https://github.com/adamsitnik/ProcessPlayground/tree/main/Benchmarks, implement their counterparts using the standard libraries in golang.

Add a short document that explains how to run these benchmarks following all the best practices (like run in Release mode etc). Assume the reader is not familiar with go.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Implement Process benchmarks using golang #24

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[adamsitnik]

@copilot please address my feedback

[adamsitnik]

It's almost ready, @copilot please address my feedback regarding excluding benchmark setup from the reported time

[adamsitnik]

@copilot PTAL at my feedback

[adamsitnik]

@copilot it still fails on Windows, but I can merge it as is and you can send a follow PR

[Copilot]

Acknowledged. The Windows shell redirection issue can be addressed in a follow-up PR. The benchmark might need additional investigation on Windows to determine the root cause (possibly related to how cmd.exe handles the redirection syntax with paths containing spaces or special characters, or potential issues with the dotnet command availability/PATH configuration on the test system).