[FLINK-24786][state] Introduce and expose RocksDB statistics as metrics

[Myasuka]

What is the purpose of the change

Introduce and expose RocksDB statistics as metrics.

Brief change log

• Introduce RocksDB statistics based metrics.
• Expose these native metrics via RocksDBNativeMetricMonitor.

Verifying this change

This change added tests and can be verified as follows: RocksDBNativeMetricMonitorTest.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? yes
• If yes, how is the feature documented? docs

[flinkbot]

CI report:

• 0c84c4a Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[masteryhx]

Thanks for the PR!
I've left some comments, PTAL.

[masteryhx]

Could we also create a new class called "RocksDBStatistics" and use it just like "RocksDBProperty" ?
Maybe it could be clearer to me. WDYT?

[Myasuka]

To be honest, I think previous RocksDBProperty is a bit complex, and I prefer to use the full metrics name in the source code as it could be easily searched.

[masteryhx]

LGTM

[Myasuka]

@flinkbot run azure

[Myasuka]

@flinkbot run azure

[Myasuka]

@masteryhx Thanks for the review, and I will merge this PR since the CI is green finally.