high latency for shardingsphere-jdbc initializing schema metadata in Single table rule

version: shardingsphere-jdbc-5.5.2
we have about 4500 tables in our database. and the rule configuration is as below. there are no other rules except the SINGLE one. The initialization latency is about 4 minutes.
```
rules:
- !SINGLE
tables:
- "ds0.restful_message_b_table"
defaultDataSource: ds0
```
I analyzed the initialization procedure and found it is blocked in `org.apache.shardingsphere.mode.metadata.persist.service.metadata.table.TableMetaDataPersistService::persist`.
Can we optimize the `persist` method by parallel execution.

Start by reading org.apache.shardingsphere.mode.metadata.persist.service.metadata.table.TableMetaDataPersistService::persist and tracing how it is reached during Single table rule initialization. Measure initialization with the reported 4,500-table database and verify that the latency is reduced without changing the metadata persisted.

Written by the indexing model from the issue text.