arrow

GH-44686: [GLib] Add GArrowStringViewDataType (#44687)



### Rationale for this change

The `arrow::StringViewType` has been introduced.
GLib needs to be implemented as the `GArrowStringViewDataType`.

### What changes are included in this PR?

Introduce `GArrowStringViewDataType`

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.

* GitHub Issue: #44686

Authored-by: Hiroyuki Sato <hiroysato@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>