ARROW-4886: [Rust] Cast to list with offset
ARROW-4886: [Rust] Cast to list with offset

The initial problem with casting a primitive array to a list array (with 1 primitive per list slot) where the primitive had an offset, is now solved.

This PR just enables such casting, as it was previously disabled.

Author: Neville Dipale <nevilledips@gmail.com>

Closes #4365 from nevi-me/ARROW-4886-2 and squashes the following commits:

77abc75b <Neville Dipale> change list cast to (i32 -> f64)
59a59f03 <Neville Dipale> ARROW-4886:  Cast to list with offset

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