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PARQUET-2204: [parquet-cpp] TypedColumnReaderImpl::Skip should reuse scratch space (#14509)

TypedColumnReaderImpl::Skip allocates scratch space on every call. The scratch space is used to read rep/def levels and values and throw them away. The memory allocation slows down the skip based on microbenchmarks. The scratch space can be allocated once and re-used.



Lead-authored-by: Fatemah Panahi <panahi@google.com>
Co-authored-by: Fatemah Panahi <fatemehp@users.noreply.github.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>