Feat: Buffer Implementation

[FW-Nagorko]

This pull request introduces a new metrics buffering system and introduces a DeviceID tagging system. The main changes include implementing the buffer.h/buffer.cc system for efficient metrics storage and updating all collectors to use the new DeviceID type.

Metrics Buffering System:

• Added new SeriesBuffer and MetricsBuffer classes in buffer.h/buffer.cc to efficiently store and manage time-series metric samples, including thread-safe access and snapshotting. [1] [2]
• The MetricsBuffer maps MetricType and DeviceID combination to a corresponding SeriesBuffer.
• The SeriesBuffer holds a ring buffer of Samples as well as write and read markers. It enables pushing new samples, getting a snapshot of unread metrics and acking the snapshot to advance the read marker.

DeviceID tagging

• The Metric struct was updated to include a deviceId field that identifies the device that a measurement was performed on.
• Collectors were updated to detect hardware and measure the requested metrics on all avaliable devices.
• The combination of MetricType and DeviceID identifies metrics.

These changes enhance the flexibility, correctness, and maintainability of the agent's metrics collection and buffering infrastructure.

[varev-dev]

lgtm