#AI commit# [fix][PES][datasource] fix DB2 schema query to use correc…

[aiceflower]

…t SQL instead of invalid command (#5409)

• Fix getAllDatabases() method in DB2 SqlConnection classes
• Replace invalid "list database directory" command with proper SQL query
• Add configurable schema query SQL with default filtering system schemas
• Query SYSCAT.SCHEMATA to get actual schema list from DB2

What is the purpose of the change

EngineConn-Core defines the the abstractions and interfaces of the EngineConn core functions.
The Engine Service in Linkis 0.x is refactored, EngineConn will handle the engine connection
and session management.

Related issues/PRs

Related issues: close #590 close #591
Related pr:#591

Brief change log

• Define the core abstraction and interfaces of the EngineConn Factory;
• Define the core abstraction and interfaces of Executor Manager.

Checklist

• I have read the Contributing Guidelines on pull requests.
• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the Linkis mailing list first)
• If this is a code change: I have written unit tests to fully verify the new behavior.

[casionone]

LGTM.