Implement Pathname#cleanpath_aggressive

[ ] Write Rust implementation of Pathname#cleanpath_aggressive to FasterPath.cleanpath_aggressive
[ ] Write refinements and monkey-patches for Pathname#cleanpath_aggressive and map implementation to Pathname.new(result)
[ ] Write tests proving FasterPath.cleanpath_aggressive operates the same as Pathname#clean_path_aggressive
[ ] Write benchmarks in test/benches and compare the performance.
[ ] Copy benchmarks to test/pbench/pbench_suite.rb

danielpclark / faster_path