feat: add support for 'kustomize edit add configuration' command

[rohithnarasimha]

Add a new subcommand 'kustomize edit add configuration' to programmatically add configuration file references to kustomization.yaml files. This brings configurations support in line with other 'kustomize edit add' subcommands (generators, transformers, validators).
Features:

• Support for single and multiple configuration file paths
• Glob pattern expansion (e.g., ./configs/*.yaml)
• Duplicate detection with user logging
• Idempotent operation

Fixes #5987

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: rohithnarasimha / name: Rohith (218468e)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rohithnarasimha
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[rohithnarasimha]

/ok-to-test

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@rohithnarasimha: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/ok-to-test

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[rohithnarasimha]

@koba1t @varshaprasad96
can you please review and please proved sign to test