feat: add batched int group stats API and expand benchmark variants

Introduces a `batch_int_group_stats` API for computing presence counts, sums, minimums, and maximums across sparse and dense matrix representations. The selection layer now utilizes this batched approach to optimize aggregation semantics for boolean and numeric operations. Additionally, reorganizes the benchmarking infrastructure to support querying across presence and count index variants in both dense and sparse formats, including new packing scripts and updated statistics aggregation.

benchmark/aggregate_stats.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 # Usage: aggregate_stats.sh TYPE
-# TYPE = indexing_presence | indexing_count | verify_presence | verify_count
+# TYPE = indexing_presence | indexing_count | verify_presence | verify_count |
+#        query_presence_dense | query_presence_sparse |
+#        query_count_dense | query_count_sparse
 #
 # Reads all stats/TYPE/*.stats files (one CSV data row each, no header).
 # Creates a new stats/TYPE/run_NNN.csv only if any .stats file is newer than
@@ -24,7 +26,7 @@ case "${TYPE}" in
     specific_kmer_presence|specific_kmer_count)
         HEADER="run,species,rebuild_wall_s,rebuild_rss_b,pack_wall_s,pack_rss_b,filter_total_wall_s,filter_total_rss_b,select_wall_s,select_rss_b,select_total_wall_s,select_total_rss_b"
         ;;
-    query_dense|query_sparse)
+    query_presence_dense|query_presence_sparse|query_count_dense|query_count_sparse)
         HEADER="run,species,strain,query_wall_s,query_rss_b,total_wall_s,total_rss_b"
         ;;
     verify_query)