[C++][Parquet] Add benchmarks for micro benchmark for DELTA_LENGTH_BYTE_ARRAY

[mapleFU]

Describe the enhancement requested

Describe the enhancement requested

Now that we support the DELTA_BINARY_PACKED encoding for both reading and writing, we can add some benchmarks for it.

Component(s)

C++, Parquet

[mapleFU]

@rok would you mind me to take it and finish it this weekend?

[rok]

@mapleFU please go ahead! :)