feat: add warmup option to benchmark

[Copilot]

• Add warmup option to BenchmarkOptions interface in benchmark.d.ts
• Implement warmup logic in benchmark.js to call f() N times before the run
• Create tests to validate the warmup functionality
• Run tests to ensure changes work correctly
• Verify linting passes (formatting applied only to relevant files)
• Request code review (no issues found in implementation)
• Run security checks (no vulnerabilities found)
• Reverted unrelated formatting changes

Summary

Successfully implemented the warmup option for the benchmark function. The feature allows users to specify how many times to call the benchmarked function before the actual benchmark run, using the same data/arguments.

Key Features:

• Integer warmup option with default value of 0
• Works with both sync and async functions
• Supports args cycling (same as benchmark loop)
• Fully tested with 5 comprehensive test cases
• No breaking changes to existing API
• Zero security vulnerabilities

Original prompt

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This section details on the original issue you should resolve

<issue_title>add warmup option to benchmark</issue_title>
<issue_description>Should be an integer of how much times to call f() before the run, on the same data</issue_description>

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

• Fixes add warmup option to benchmark #55

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