PyTorch Accelerator Integration Enhancements

[FFFrog]

Current progress:

• RFC (Under development)
• Python-based OpenReg code refactoring (Under development)
• Document related to Operator Registration.(TBD)

Plan:

• submit PR in the community this week Refactor and Improve the OpenReg Module pytorch/pytorch#158090

[zeshengzong]

• RFC: Add PyTorch Accelerator Integration Enhancements pytorch/rfcs#79
• OpenReg Improvements: [Feat] Tracking for OpenReg Improvements pytorch/pytorch#158917