feat: add dapr mcpservers cli cmd

[sicoyle]

Description

Summary

• Adds dapr mcpservers -k command to list MCPServer CRD resources in Kubernetes
• Supports --name, --namespace, --all-namespaces, and -o json/yaml flags
• Follows the same pattern as dapr components -k and dapr configurations -k

This will fail until my upstream PR here is merged with the clientset changes required for this:
dapr/dapr#9742

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

Adds a new Kubernetes-mode CLI command (dapr mcpservers -k) to list Dapr MCPServer CRD resources, aligning output/flags with existing components and configurations listing patterns.

Changes:

• Introduces Kubernetes client helpers to list/print MCPServer resources with table and JSON/YAML output.
• Adds a new dapr mcpservers Cobra command with --name, --namespace, --all-namespaces, and -o flags.
• Adds unit tests for listing/filtering behavior and endpoint-derived fields (transport/URL).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
pkg/kubernetes/mcpservers.go	Implements listing, filtering, table output, and JSON/YAML detail output for MCPServers.
pkg/kubernetes/mcpservers_test.go	Adds tests for write path, transport detection, and URL derivation.
cmd/mcpservers.go	Adds the new dapr mcpservers CLI command and flags wiring.

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