[JSON] Support lists through `ROW` type instead of `VARIANT`

[jeppe742]

For json streams, columns with array types will be mapped to VARIANT in iceberg.
However, as we are currently waiting for Trino to support VARIANT (trinodb/trino#27753), this means that we are unable to read data with arrays.

In theory you should also be able to represent the data using ROW type (struct)

[george-zubrienko]

Currently we use the following type translation: TEXT -> JSON (Jackson) -> AVRO -> ARCANE -> ICEBERG

AVRO's complex types like ARRAY are then mapped to VARIANT to avoid handling cases like ARRAY, since JSON source was added before we had Struct support. This should be now changed to corresponding Arcane types, since we have StructType up and working.

There is also an option of a direct parse AVRO -> Iceberg and then Iceberg -> Arcane -> Iceberg (i know sounds funny). I'll explore both options and propose a final solution.