docs: update CONTRIBUTING.md with guidelines on using the node: namespace

[lumirlumir]

This pull request includes an update to the CONTRIBUTING.md file to provide guidance on the usage of the node: namespace prefix for built-in modules in Node.js. The most important change is the addition of a new section explaining the recommended usage patterns for different parts of the project.

Documentation updates:

• CONTRIBUTING.md: Added a new section titled "Others" with a subsection on the node: namespace. It explains that standard imports without the node: prefix should be used for regular application code for broader compatibility, while the node: prefix can be used in test files that use the node:test runner.

[github-actions]

Labels have been automatically applied based on the conventional commit types.🏷️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0c6424a) to head (0ec92a0).
Report is 1 commits behind head on main.

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  Coverage   100.00%   100.00%           
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  Files           11        11           
  Lines           64        64           
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  Hits            64        64           

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