[Swift] Support `list` (Array) type

[dongjoon-hyun]

Describe the enhancement requested

Although ArrowType has list.

https://github.com/apache/arrow/blob/cf7d7e2b16d65ce96681219f1e01aa0cb932a826/swift/Arrow/Sources/Arrow/ArrowType.swift#L60

Struct is the only supported complex type.

https://github.com/apache/arrow/blob/cf7d7e2b16d65ce96681219f1e01aa0cb932a826/swift/Arrow/Sources/Arrow/ArrowType.swift#L153

Component(s)

Swift

[dongjoon-hyun]

cc @kou

[mgrazianoc]

I'm working on this right now, it will probably be ready this week. It's working on my setup, for nested lists too. Just making sure it is ready for production.