Convenience method to create DataType::List correctly

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The embedded field type of a List must always be called "item" -- you can see this is done everywhere in the arrow-rs codebase that a DataType::List is created: https://github.com/search?q=repo%3Aapache%2Farrow-rs+%22%5C%22item%5C%22%22&type=code

While working on https://github.com/influxdata/influxdb_iox/pull/8247 I had to make this change

-       DataType::List(Arc::new(Field::new("state", dt.clone(), false))),
+       DataType::List(Arc::new(Field::new("item", dt.clone(), true))),

to align the type with expected

Having to do this is both verbose/annoying but more to the point means we are exposing some sort of implementation detail that must be cargo-culted in many places

Describe the solution you'd like
I would like a method like this (with good documentation) to create a

let dt = DataType::new_list(DataType::Float64, true);

That would do the same thing as

let df = DataType::List(Arc::new(Field::new("item", DataType::Float64, true))),

cc @tustvold for your thoughts

Describe alternatives you've considered
Do nothing

Additional context

[alamb]

This is a nice self contained project for someone if they wanted to try their hand at the arrow codebase

[tustvold]

It isn't a requirement that the name be "item", it is purely a convention. If code is relying on this, that code is incorrect

FWIW we provide Field::new_list already which can be used with the various list constructors

[alamb]

It isn't a requirement that the name be "item", it is purely a convention. If code is relying on this, that code is incorrect

At the very least perhaps we can agree that the arrow-rs codebase has very little test coverage of a DataType::List that does not follow the convention (I found one example)

[fansehep]

it seems just add a pub fn in arrow-schema/src/datatype.rs ? and the default name is "item" ?