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GH-45396: [C++] Use Boost with ARROW_FUZZING (#45397)

### Rationale for this change

We need `arrow_testing` for `ARROW_FUZZING`. And `arrow_testing` needs Boost.

### What changes are included in this PR?

Use Boost with `ARROW_FUZZING`.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #45396

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