Restructure Task Directory by Take Type and Difficulty Level

[irvineoy]

We should reorganize the task directory to make it more structured and easier to navigate. A clearer hierarchy based on task type and difficulty level would help both development and evaluation.

For example, tasks could be organized as follows:

Tasks/
  HIP2HIP/
    level1/
    level2/
    level3/
  Triton2Triton/
    level1/
    level2/
    level3/
  Pytorch2HIP/
    level1/
    level2/
    level3/

This structure makes the task scope and complexity explicit, and it should scale well as we add more task categories in the future.