feat(client-cpp): add basic TableModel settings & insertRelationalTablet interface

[xiangmy21]

Description

Added initial table model support for the C++ client. The main changes include:

• Added sqlDialect and database members to the Session class.
• Added columTypeList member to the Tablet class to identify column types.
• Added insertRelationalTablet function to support inserting Table Model Tablets.
• Added sessionRelationalIT.cpp test.
• Added SessionTableModelExample.cpp example.

[github-actions]

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