[cdc] Optimize SyncDatabaseAction performance by removing listTables calls

[huyuanfeng2018]

Purpose

from #5955

What is the purpose of the change

Optimize SyncDatabaseAction performance by removing expensive listTables operations during initialization, improving scalability for databases with many tables.

Brief change log

• Remove listTables() call from RichCdcMultiplexRecordEventParser
• Implement lazy table creation in CdcDynamicTableParsingProcessFunction#processElement
• Remove createdTables Set to reduce memory usage

Verifying this change

• Verified existing functionality remains intact

Testing

This optimization does not require additional test cases as the existing functionality is already covered by:

• SyncDatabaseActionBaseTest.testSyncTablesWithoutDbLists() - validates table filtering logic
• SyncDatabaseActionBaseTest.testSyncTablesWithDbList() - validates database filtering logic
• SyncDatabaseActionBaseTest.testSycTablesCrossDB() - validates cross-database filtering scenarios

All these tests create and use RichCdcMultiplexRecordEventParser, ensuring the optimization doesn't break existing functionality.