[IOTDB-5162] Optimize concurrent schema fetch for same schema

[MarcosZyk]

Description

Motivation

When there are different requests trying to fetch the same schema, for example concurrent data insertion for same device and concurrent data query for same timeseries, it's consuming to execute schema fetch for each request when all of them miss the cache.

Modification

Implement device level schemaFetch concurrency control in new extracted ClusterSchemaFetchExecutor.