Allow creation of StringArrays from Vec<String>

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
The usecase is I have a Vec of derived String values but I can not create a StringArray from them

Describe the solution you'd like
I would like to be able to run:

let my_array = StringArray::from(v);

For any v that has things that can be borrowed as str or Option<str> (including String and others) rather than only str).

It looks like there is some attempt to be able to do this already: https://github.com/apache/arrow-rs/blob/master/arrow/src/array/array_string.rs#L208 but it isn't clear to me why it doesn't work

Additional context
Here is an example

fn main() {
    // I want to make a StringArray from a derived type
    let my_data = vec!["Foo", "Bar", "Baz"];
    let my_derived_data = my_data.iter()
        .map(|s| format!("Some transformed data"))
        .collect::<Vec<_>>();

    let a = StringArray::from(my_data); // works!
    assert_eq!(a.len(), 3);

    // however, if I want to to create a StringArray from an array of Strings, that is no good
    //let b = StringArray::from(my_derived_data); // <----- does not work!
    //assert_eq!(b.len(), 3);

//    |
// 14 |     let b = StringArray::from(my_derived_data); // does not work!
//    |             ^^^^^^^^^^^^^^^^^ the trait `From<Vec<String>>` is not implemented for `GenericStringArray<i32>`
//    |
//    = help: the following implementations were found:
//              <GenericStringArray<OffsetSize> as From<ArrayData>>
//              <GenericStringArray<OffsetSize> as From<Vec<&str>>>
//              <GenericStringArray<OffsetSize> as From<Vec<Option<&str>>>>
//              <GenericStringArray<T> as From<GenericListArray<T>>>
//    = note: required by `from`
}