Optimize stroke cache and benchmark configurations

- Updated stroke cache to use parallel processing for pixel checks.
- Modified benchmark commands in notlar.txt to ensure consistent output and baseline comparisons.
- Created a plan for merging criterion directories and optimizing benchmark performance, including pre-allocation of buffers and various optimization strategies.
- Removed redundant output directory settings in benchmark files and ensured all benchmarks write to a single criterion directory.
- Updated documentation to reflect changes in benchmark paths and configurations.

hcie-engine-api/benches/composite_scratch_pooling.rs

@@ -142,9 +142,5 @@ fn bench_composite_scratch_pooling(c: &mut Criterion) {
     group.finish();
 }
 
-criterion_group!{
-    name = benches;
-    config = Criterion::default().output_directory(std::path::Path::new("criterion"));
-    targets = bench_composite_scratch_pooling
-}
+criterion_group!(benches, bench_composite_scratch_pooling);
 criterion_main!(benches);