Isolate metrics options

[garyschulte]

Testing greptile review bot

[greptile-apps]

PR Summary

Isolated metrics options from BesuCommand into a new MetricsOptionGroup class, improving code organization and modularity.

• Created new MetricsOptionGroup class in besu/src/main/java/org/hyperledger/besu/cli/options/stable/MetricsOptionGroup.java
• Moved metrics-related command-line options from BesuCommand to MetricsOptionGroup
• Updated BesuCommand to use the new MetricsOptionGroup for handling metrics options
• Implemented getter methods in MetricsOptionGroup for accessing metrics configuration
• Set default values for most metrics options in MetricsOptionGroup for easier out-of-the-box usage

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