Feat: Add Markdown table report for benchmark results

[presham]

Summary

• Add new benchmark formatting logic (formatDuration, formatBytes, toMarkdown) to create human-readable report report.md to an existing benchmark/write-snapshot.ts module
• Extract benchmark formatting logic (formatDuration, formatBytes, toMarkdown) into a new benchmark/markdown.ts module
• Update write-snapshot.ts to import from markdown.ts and write a human-readable report.md alongside the existing report.json
• Re-run benchmark snapshot (report.json + new report.md)
• Add unit tests for all three exported functions covering unit-boundary conversions, the — fallback when heap/gc data is absent, and multi-row rendering

Linked Issue

Closes: #612

Verification

• node --test workspaces/js-x-ray/test/markdown.spec.ts passes
  (14 tests across formatDuration, formatBytes, toMarkdown)
• Existing test suite has no regressions
• npx eslint workspaces reports no errors
• Build pass npm run build

Report

Test

[changeset-bot]

🦋 Changeset detected

Latest commit: 8cbabd7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@nodesecure/js-x-ray	Patch

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[presham]

Hi @clemgbld
This is my first contribution to this project. I've addressed [#612] by adding a readable format for the benchmark results. Would appreciate a review when you have time!

[clemgbld]

@resham57 Thanks for your contribution ! can you add the changeset
https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md

[presham]

@resham57 Thanks for your contribution ! can you add the changeset https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md

It's my pleasure, @clemgbld. I've applied the changes you have mentioned and added a new changeset. Could you please review them once more and let me know if any further changes changes are required? I'll be happy to make them. Thank you!