fix: implement component-defined metrics to break logger dependency

[sumansaurabh]

Summary

Implements component-defined metrics system to resolve dependency issues between devices and Firecracker's logger implementation.

Changes Made

• Introduced Metric trait in vmm-sys-util for generic metrics interface
• Refactored devices to define and manage their own metrics
• Removed hard dependency on Firecracker-specific logger from device components
• Updated metric collection and reporting mechanisms

Why This Change

This change is particularly important for devices as it allows them to operate independently of Firecracker's logging infrastructure, improving modularity and reusability of device components.

Fixes #1759

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This PR was created from task: https://cloud.blackbox.ai/tasks/L44NtJCkLwh9TZ_Noc0zD