feat(ctl): add YAML output support to kmeshctl dump

[Psykii22]

What type of PR is this?

/kind feature

What this PR does / why we need it

Currently, kmeshctl dump supports output in table format or raw JSON only. While JSON is useful for machine processing, it can be difficult to read when inspecting large configurations.

This PR adds support for -o yaml, allowing users to view the daemon's configuration in a more human-readable format. The implementation converts the existing JSON output into YAML using sigs.k8s.io/yaml, providing an experience consistent with common Kubernetes tooling such as kubectl.

Special notes for your reviewer

The implementation has been tested locally against a Kind cluster, and the output is rendered correctly in YAML format.
Please let me know if any additional changes or tests are needed.

Does this PR introduce a user-facing change?

Added support for the `-o yaml` flag in `kmeshctl dump`, enabling daemon configuration output in YAML format.

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[kmesh-bot]

Welcome @Psykii22! It looks like this is your first PR to kmesh-net/kmesh 🎉

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the kmeshctl dump command by introducing YAML output support. By allowing users to view daemon configurations in YAML, the tool becomes more consistent with standard Kubernetes CLI patterns and improves readability for complex configuration data.

Highlights

• YAML Output Support: Added support for the -o yaml flag in the kmeshctl dump command to provide a more human-readable configuration format.
• CLI Flag Update: Updated the help description for the output flag to include yaml as a valid option.
• JSON to YAML Conversion: Integrated sigs.k8s.io/yaml to handle the conversion of existing JSON output into YAML format.

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Data in tables, JSON too, / Now YAML joins the view. / A readable sight, / To make things right, / For all the work we do.

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Code Review

This pull request adds support for a "yaml" output format to the kmeshctl dump command by converting the JSON response body using sigs.k8s.io/yaml. Feedback on the changes suggests improving error handling during the YAML conversion: instead of exiting with os.Exit(1) when conversion fails, the code should log the error and fall back to printing the raw response body, which ensures that non-JSON error messages from the daemon are still visible to the user.

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