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GH-40872: [C++][Parquet] Encoding: Optimize DecodeArrow/Decode(bitmap) for PlainBooleanDecoder (#40876)



### Rationale for this change

This is for enhance boolean decoding. I optimized the `DecodeArrow` for PlainBoolean

### What changes are included in this PR?

Optimize DecodeArrow/Decode(bitmap) for PlainBooleanDecoder, and add benchmarks

### Are these changes tested?

Yes

### Are there any user-facing changes?

Minor optimization. And `Decode` boolean will change the syntax

* GitHub Issue: #40872

Lead-authored-by: mwish <maplewish117@gmail.com>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: mwish <maplewish117@gmail.com>