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GH-36773: [C++][Parquet] Avoid calculating prebuffer column bitmap mu…
…ltiple times (#36774) ### Rationale for this change According to #36192 and #36649 . RowGroupReader using a bitmap to control a column-level prebuffer. However, if all columns are selected, this will be a heavy overhead for building a bitmap multiple times. ### What changes are included in this PR? Build `Prebuffer` Bitmap once, and reuse that vector. ### Are these changes tested? no ### Are there any user-facing changes? no * Closes: #36773 Authored-by: mwish <maplewish117@gmail.com> Signed-off-by: Antoine Pitrou <antoine@python.org>
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