feat(node-service): L1 reorg metrics

[clabby]

Overview

Adds a metrics module to the kona-node-service crate and introduces an L1 reorg count metric.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.7%. Comparing base (15a9a27) to head (2775fc8). Report is 4 commits behind head on main.

:white_check_mark: All tests successful. No failed tests found.

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