More examples: geometry and table creation

[alex-clickhouse]

Note

Adds new example coverage and wires it into the examples runner.

• Introduces DataTypes_006_Geometry.cs demonstrating geometry types (Point, Polygon), WKT parsing (readWKT*), H3 indexing (geoToH3, h3ToGeo, h3ToGeoBoundary), point-in-polygon checks, and great-circle distance queries, with small temp tables for demos
• Adds Tables_002_CreateTableCluster.cs (ReplicatedMergeTree with ON CLUSTER and macros) and Tables_003_CreateTableCloud.cs (cloud defaults, no ENGINE/ON CLUSTER) examples
• Updates Program.cs to run GeometryTypes
• Updates examples/README.md to list the new examples

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