Add some benchmarks for decoding delta encoded Parquet

[etseidl]

Which issue does this PR close?

• Part of Speedup DELTA_BINARY_PACKED decoding when bitwidth is 0 #9476.

Rationale for this change

Add benchmarks to show benefit of the optimizations in #9477

What changes are included in this PR?

Adds some benches for DELTA_BINARY_PACKED, DELTA_BYTE_ARRAY, and DELTA_LENGTH_BYTE_ARRAY. The generated data is meant to show the benefit of special casing for miniblocks with a bitwidth of 0.

Are these changes tested?

Just benches

Are there any user-facing changes?

No

[etseidl]

I noticed the added benches were using bench_array_reader_skip rather than bench_array_reader. I've corrected that and now there are skip and non-skip versions of the integer benches.