[DEVELOPMENT] Pass Infrastructure Related Milestones

[sunggg]

For the fast prototyping, I'm planning to implement following functionalities in Python and convert them into C++ once it becomes mature.

• [x] Tuning pass
• [ ] Extend the relax build: to expose more optimization opportunity to pass infra (e.g., fusion)
• [ ] Overall user-facing interface (e.g., pass sequence registration, feature handling, dependency...)