feat: Implement dedicated microcks health check command

[kunal-yelgate]

Description

This pull request implements the new microcks health command to provide quick diagnostics about configured Microcks server instances. It determines reachability, request latency, API responsiveness, subsystem health (Database, Keycloak, Async Minion), and detects the active server version.

Key Features

• Diagnostics command: Hitting microcks health gives a formatted overview of the server's health status.
• Machine-readable JSON: Supports --json flag to print structured JSON representing server health and latency.
• Watch mode: Supports --watch and --interval options to continuously check status on a loop.
• Automation-friendly exit codes: Returns 0 if healthy, 1 if unreachable or network/API failure occurs, and 2 if reachable but degraded.
• Complete Test Coverage: Includes a comprehensive test suite in cmd/health_test.go verifying parsing, output formats, watch mode, and exit codes.

[github-actions]

👋 @kunal-yelgate

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[github-actions]

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