feat(metrics): integrate new metrics for table delay, fields per second, and event loop busy ratio

[Gezi-lzq]

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[Copilot]

Pull Request Overview

This PR integrates new metrics for table delay, fields per second, and event loop busy ratio by implementing a new gauge system using OpenTelemetry and adding network bandwidth limiting for Iceberg writes.

• Adds new LongGaugeBundle and DoubleGaugeBundle classes to the Metrics system for observable gauge management
• Refactors table metrics from static maps to individual gauge instances for better resource management
• Integrates network bandwidth limiting into IcebergWriter with the new ICEBERG_WRITE throttle strategy

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ThrottleStrategy.java	Adds ICEBERG_WRITE throttle strategy enum value
Metrics.java	Implements new LongGaugeBundle and DoubleGaugeBundle classes for gauge management
IcebergWriter.java	Integrates network bandwidth limiting with permit acquisition and consumption tracking
EventLoops.java	Adds busy ratio tracking and gauge recording for event loops
TableTopicMetricsManager.java	Refactors from static suppliers to individual gauge registration system
TableCoordinator.java	Updates to use new gauge-based metrics instead of static maps

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