Add benchmarks

[bchapuis]

This PR is intended at improving the implementation of the geoparquet parser. It should not be merged due to licensing issues (JMH GPL).

[bchapuis]

@sebr72 As discussed, I added some benchmarks to baremaps. I also added a pure sequential spliterator (used in the read() method) to have a comparison point. I think this will help us better evaluate the performence. Here are the results when reading lots of small files.

Benchmark                        Mode  Cnt    Score   Error  Units
SmallFileBenchmark.read          avgt       545.925          ms/op
SmallFileBenchmark.readParallel  avgt       537.830          ms/op

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Quality Gate failed

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C Reliability Rating on New Code (required ≥ A)

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