Add FlintDelegatingSessionCatalog

[penghuo]

Description

In Spark. spark_catalog default catalog name. With FlintDelegatingSessionCatalog, User could customize
catalog name, the implementation delegate to V2SessionCatalog in current SparkSession.

Usage

Add configuration
  --conf spark.sql.catalog.mycatalog = org.opensearch.sql.FlintDelegatingSessionCatalog

Run query
  USE mycatalog;
  SHOW catalogs;
   > mycatalog

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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