Partially working implementation of primal_module_parallel.rs and dual_module_parallel.rs

[YangLiuWillow]

• primal_module_parallel.rs works when there is only one dual_node in each unit. Likely due to the different global_time in different unit being used when storing Obstacle in priority queue of each unit. Perhaps it would help to assign each edge a pointer to the global_time in its respective unit.
• dual_module_parallel.rs seems to work fine.
• After I changed edge and vertex accessing to pointers, primal_module_serial.rs and dual_module_pq.rs no longer works with plugin_single_hair.rs. I have yet to figure out why. It is likely due to how Obstacle is hashed. For now, when I run plugin_single_hair_debug_1 test, it generates way too manydual_nodes (like nearly 1k).
• generate animation for primal_module_parallel.rs: run the test cases in primal_module_parallel.rs. E.g. for defect_vertices = [7, 21, 28], run cargo test primal_module_parallel_tentative_test_2 -- --nocapture.