Gauge metric to help debug LevelDB compactions?

[Aracki]

Rationale

We have only eth_db_chaindata_compact_nonlevel0 & eth_db_chaindata_compact_level0 regarding LevelDB compaction levels.

It would be helpful to have the gauge metric which would represent the current number of L0, L1, L2,... tables.
Now it can be monitored only within LevelDB logs.

e.g.

17:32:48.421253 table@move L3@151145047 -> L4
17:32:48.501054 version@stat F·[25 380 3851 38027 101486 656155 3398169] S·7TiB[96GiB 768MiB 7GiB 75GiB 150GiB 976GiB 6TiB] Sc·[6.25 7.68 7.69 7.69 1.54 1.00 0.67]

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[rjl493456442]

Reasonable request, would you like to submit a PR for it?

[Aracki]

I would be happy to help if I find time. It's good to hear there are reasons to add it. 🤞

[vvarl0cks]

let's see.

[rjl493456442]

It's merged in #27643