[Rust]: Remove unsafe value_slice method from PrimitiveArray and BooleanArray

[asfimport]

Split out from ARROW-10990 which was the last internal user of that method. The same result can be achieved in a safer way by using values()[offset..offset+len]. The raw_values method in BooleanArray is also unused and could be removed.

Reporter: Jörn Horstmann / @jhorstmann
Assignee: Jörn Horstmann / @jhorstmann

Related issues:

• [Rust] Use slices for iterating primitive arrays (is related to)

PRs and other links:

• GitHub Pull Request #9069

_{Note: This issue was originally created as ARROW-11099. Please see the migration documentation for further details.}

[asfimport]

Jorge Leitão / @jorgecarleitao:
Issue resolved by pull request 9069
#9069