feat(controller): Implement controller commands

[jongwooo]

This pull request introduces a new controller command group to the CLI, allowing users to interact with a "morpher controller" via subcommands for pinging and retrieving information. It also adds a comprehensive client implementation for communicating with the controller, along with a full suite of unit tests for the client. The most important changes are grouped below:

CLI Command Additions

• Added a new controller command group with ping and info subcommands, enabling users to check connectivity and retrieve controller details from the CLI (cmd/controller/controller.go, cmd/controller/ping.go, cmd/controller/info.go). [1] [2] [3]
• Registered the new controller command group in the root CLI command, making it available to users (cmd/root.go). [1] [2]

Controller Client Implementation

• Implemented a new Client in internal/controller/client.go to handle HTTP communication with the controller, including methods for ping, info retrieval, health checks, and configuration management.

Testing

• Added a comprehensive test suite for the controller client, covering client creation, ping and info requests, health checks, and authorization header handling (internal/controller/client_test.go).

[Copilot]

Pull Request Overview

This PR introduces a new controller command group to the CLI for interacting with a morpher controller, including ping and info subcommands. The implementation provides HTTP client functionality with authentication support and comprehensive test coverage.

• Added controller CLI commands (controller ping and controller info) for checking connectivity and retrieving controller information
• Implemented HTTP client with authentication, timeout configuration, and health check capabilities
• Added comprehensive unit test suite covering client creation, HTTP requests, and authorization handling

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
cmd/root.go	Registers the new controller command group
cmd/controller/controller.go	Defines the main controller command group
cmd/controller/ping.go	Implements ping subcommand for connectivity checks
cmd/controller/info.go	Implements info subcommand for retrieving controller details
internal/controller/client.go	HTTP client implementation with configuration management
internal/controller/client_test.go	Comprehensive test suite for the controller client

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