params: improve func BuildConfigIndex()

[gzliudan]

Proposed changes

Use modern go language to improve function BuildConfigIndex

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR modernizes the BuildConfigIndex() function in the params package by replacing a manual O(n²) bubble sort implementation with modern Go standard library functions. The refactoring improves code readability and performance while maintaining the same functionality.

Key Changes:

• Replaced manual loop and bubble sort with slices.Collect(maps.Keys()) and slices.SortFunc()
• Added comprehensive test case to verify descending order sorting behavior
• Reduced code complexity from ~10 lines to ~3 lines

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
params/config.go	Refactored BuildConfigIndex() to use modern Go standard library functions (maps.Keys, slices.Collect, slices.SortFunc) for improved performance and readability
params/config_test.go	Added new test TestBuildConfigIndexDescendingOrder to verify the descending order sorting behavior with a clean, isolated test case

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