[LTC] Adopt the extensible LazyGraphExecutor (#4106)
* [LTC] Adopt the extensible LazyGraphExecutor
Summary:
This is a companion pull request to adopt the upstream pytorch#87218 which
makes the LazyGraphExecutor extensible.
Test Plan:
PJRT_DEVICE=TPU python ../test/test_torch.py TestTorchDeviceTypeXLA
* Add the torch pin
* fix linter
* Delete .torch_pin
Co-authored-by: JackCaoG <59073027+JackCaoG@users.noreply.github.com>
