Add database operation metrics

[huiwq1990]

What would you like to be added?

Expose metrics url for clustersynchro-manager, and monitor database operations. Just like: https://github.com/profects/gormetrics

Why is this needed?

We want to know the pressure on the database caused by clustersynchro-manager component.

[clusterpedia-bot]

Hi @huiwq1990, Thanks for opening an issue! We will look into it as soon as possible.

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