Add memory usage stats for disk table

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#1,260 opened on Feb 18, 2022 1 comment 0 reactions 2 assignees Claimed by @Leowner View on GitHub

enhancement

Description

**Is your feature request related to a problem? Please describe.**
Online monitoring

**Describe the solution you'd like**
rocksdb memory usage can be obtained its APIs: https://github.com/facebook/rocksdb/wiki/Memory-usage-in-RocksDB

This issue has not been assessed yet.