v3 spec types — Variant, Geometry, Geography, Unknown

[Shekharrajak]

Is your feature request related to a problem or challenge?

Forward-compat with v3 tables produced by Spark. We must extend PrimitiveType enum + Arrow type mapping + Avro schema + serde. Reference Java org.apache.iceberg.types.Types.

Describe the solution you'd like

No response

Willingness to contribute

I can contribute to this feature independently

[jimmystewpot]

There's a PR already in progress to support VARIANT: #2188

There's an epic tracking all the v3 support work here: #2411