📖 [Story] Converter coverage for GPT2

[bowang007]

TL;DR

operation converters in dynamo to support full compilation for GPT2

Goal(s)

Run GPT2 on multi-gpu with only 1 TensorRT engine.

Tasks

### Tasks
- [ ] https://github.com/pytorch/TensorRT/issues/2544
- [ ] https://github.com/pytorch/TensorRT/issues/2434
- [ ] https://github.com/pytorch/TensorRT/pull/2654
- [ ] torch.ops._c10d_functional.all_reduce.default
- [ ] torch.ops._c10d_functional.wait_tensor.default