[RFC]: Add fixer function to the ESLint rule vars-order

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Description

This RFC proposes adding a fixer function to the ESLint rule vars-order for auto formatting the variable declarations according to their length.

The goal of this change is to ease the burden for both the contributors and maintainers during the code review.

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Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.