Optimize StringView row decoding

[alamb]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Part of #5374

@XiangpengHao implemented row format --> ByteView (StringView / BinaryView) encoding/decoing in https://github.com/apache/arrow-rs/pull/5922/files

Describe the solution you'd like

1. Add a benchmark for StringView to https://github.com/apache/arrow-rs/blob/master/arrow/benches/row_format.rs
2. Make the row conversion faster

Describe alternatives you've considered
@tustvold noted that a potential performance improvement https://github.com/apache/arrow-rs/pull/5922/files#r1650032068 -- namely to build the array directly rather than build a StringArray and then convert to StringView

Additional context

[XiangpengHao]

take, as it seems that decoding string view is taking longer than it should be.

[alamb]

label_issue.py automatically added labels {'arrow'} from #6044