improve(benchmarks): better cli parsing

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TL;DR

Improved benchmark filtering with an enum-based approach and added a help menu for available benchmarks.

These changes were pulled from #298 and full credit goes to @Rexicon226

What changed?

• Introduced a Benchmark enum to strictly type available benchmark options
• Added a --help flag that displays all available benchmarks
• Replaced string-based benchmark filtering with enum matching
• Updated error handling to show usage information for invalid benchmark names
• Modified logging messages to be more precise

How to test?

1. Run zig build benchmark -- --help to view available benchmarks
2. Test individual benchmarks: zig build benchmark -- [benchmark_name]
3. Run all benchmarks: zig build benchmark -- all
4. Verify error handling by attempting to run an invalid benchmark name

Why make this change?

The enum-based approach provides better type safety and prevents typos when selecting benchmarks. The help menu improves user experience by clearly showing available options, making the benchmark system more user-friendly and maintainable.

[0xNineteen]

• #391 👈 (View in Graphite)
• main

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