Add support for Utf8View in arrow_string::length

[Omega359]

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

This came up as a result of a bug report in DataFusion: apache/datafusion#12149 where length(StringViewArray) throws an error.

Describe the solution you'd like

The length function has StringViewArray support added and tests added to cover this case.

Describe alternatives you've considered

Additional context

[Omega359]

I suspect a simple implementation would be

DataType::Utf8View => {
            let list = array.as_string_view();
            let v = list.views().iter().map(|v| *v as i32).collect::<Vec<_>>();
            Ok(Arc::new(PrimitiveArray::<Int32Type>::new(v.into(), list.nulls().cloned())))
        }
``` 
however I don't know if that would perform as best as possible.    

[Omega359]

take