internalstorage: add gorm database metrics

[Iceber]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Adding gorm database metrics to internalstorage.

The reason for using https://github.com/go-gorm/prometheus instead of https://github.com/prometheus/client_golang/blob/main/prometheus/collectors/dbstats_collector.go is to try to control the latency of calls to DB.Stats() on the clusterpedia side; after all, DB.Stats() performs a global lock!

If there is a need in the future, you can add configurations to get real-time database information.

Remove the detection of mysql or postgres databases, which should directly observe the database.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[clusterpedia-bot]

Hi @Iceber,
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