Implement writing FixedSizeList to Parquet

[kylebarron]

This is building on top of #1386 to attempt to write a packed array of values from a fixed size list array to a parquet leaf.

I'm getting a dreaded borrowed value does not live long enough that I was hoping you'd be able to give some advice on

error[E0597]: `*new_array` does not live long enough
   --> src/io/parquet/write/pages.rs:193:33
    |
159 |   fn to_leaves_recursive<'a>(array: &'a dyn Array, leaves: &mut Vec<&'a dyn Array>) {
    |                          -- lifetime `'a` defined here
...
193 |                   let new_array = new_array
    |  _________________________________^
194 | |                     .as_any()
    | |_____________________________^ borrowed value does not live long enough
...
197 |                   to_leaves_recursive(new_array.values().as_ref(), leaves);
    |                   -------------------------------------------------------- argument requires that `*new_array` is borrowed for `'a`
198 |               } else {
    |               - `*new_array` dropped here while still borrowed