feat(reexecution): collect leveldb and meterdb metrics

[DracoLi]

Why this should be merged

Enables reexecution benchmarks to collect leveldb and meterdb metrics. This allows existing leveldb or meterdb related Grafana dashboards to work with metrics from benchmark runs.

With this change, metrics like avalanche_db_non_level_0_comps and avalanche_meterdb_calls{method="get"} are available during reexecution tests as well, allowing us to monitor db performance.

How this works

• Registers leveldb metrics under avalanche_db namespace
• Wraps the database with meterdb and registers metrics under avalanche_meterdb namespace

How this was tested

I ran a reexecution benchmark and confirmed that the leveldb and meterdb metrics are visible.

Need to be documented in RELEASES.md?

No

[Copilot]

Pull request overview

This PR enables the collection of leveldb and meterdb metrics during reexecution benchmarks, allowing Grafana dashboards to monitor database performance during benchmark runs.

• Registers leveldb metrics under the avalanche_db namespace
• Wraps the database with meterdb to collect method call metrics under the avalanche_meterdb namespace

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