MB-70770: [BP] Optimize a few APIs in hierarchy search#431
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- Optimize `countRoot` to use bitmap iterator instead of bitmap.Iterate(), avoiding callback overhead. - Optimize `AddNestedDocuments` to take advantage of the monotonic, preorder nature of document numbers of the root and child documents in the segment to avoid repeatedly scanning the entire edge list multiple times. - Un-export all edge list methods as they are for internal use only.
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maneuvertomars
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