perf(index): use for loop over foreach

[Fdawgs]

Similar to fastify/fastify-sensible#138, this PR replaces a forEach loop with a traditional for loop with a cached length, which cuts down on function overhead.

Checklist

• run npm run test && npm run benchmark --if-present
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Copilot]

Pull request overview

This PR optimizes performance by replacing forEach loops with traditional for loops and caching the array length to reduce function call overhead.

• Replaces two forEach loops with for loops that cache the methodNames.length
• Reduces function overhead during plugin initialization

Comments suppressed due to low confidence (2)

index.js:47

• Incorrect closing brace. This should be a closing brace for the for loop starting at line 37, so it should be } instead of }).

  })

index.js:65

• Incorrect closing brace. This should be a closing brace for the for loop starting at line 52, so it should be } instead of }).

    })

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