arrow

GH-34322: [C++][Parquet] Encoding Microbench for ByteArray (#34323)



### Rationale for this change

After https://github.com/apache/arrow/pull/14293 . We have `DELTA_BYTE_LENTH` for encoding ByteArray. So, I'd like to have encoding benchmark for them.

### What changes are included in this PR?

Benchmark add some cases.

### Are these changes tested?

No

### Are there any user-facing changes?

No

* Closes: #34322

Authored-by: mwish <maplewish117@gmail.com>
Signed-off-by: Will Jones <willjones127@gmail.com>