Avoid creating second string_view in compute_results_count_sparse_string_range (#3491)
Avoid creating second string_view in compute_results_count_sparse_string_range (#3491)

We also declare the string view a const. This can speedup the for loop
for the comparison when there is a large number of comparisons. This can
save about 2s when there is 700 million cells being compared. Intel
V-Tune called out the string object creation inside the for loop.
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB