feat: Add execFile Support

[nithinkjoy-tech]

Issue

Closes #818

Description of changes

Added execFile support to the child_process module.

Checklist

• [X] Created unit tests in tests/unit and/or in Rust for my feature if needed
• [X] Ran make fix to format JS and apply Clippy auto fixes
• [X] Made sure my code didn't add any additional warnings: make check
• [X] Updated documentation if needed (API.md/README.md/Other)

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[Sytten]

For reference, the node implementation uses spawn under the cover: https://github.com/nodejs/node/blob/1720b18260d7f4bbd9fe0d2cbbbb05cc33e7f945/lib/child_process.js#L323 and they do in fact set a listener on 'data' to accumulate their callback value. We should go that route too if possible.

[nithinkjoy-tech]

Thank you @Sytten and @richarddavison for the review. I will refactor it to build exec and execFile upon spawn and will try to set a listener on 'data' to accumulate their callback value.

[Sytten]

@nithinkjoy-tech Do you plan on finishing the PR?

[nithinkjoy-tech]

@nithinkjoy-tech Do you plan on finishing the PR? Hi @Sytten, Thanks for following up! I don’t think I’ll be able to continue with this PR since I got stuck earlier and haven’t had the time to get back to it. Totally fine if someone else wants to take it forward.

[Sytten]

@richarddavison Do you want to take that on or not?