Support TorchScript call over remote API (RRef) (#32466)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32466
It's a follow-up work of https://github.com/pytorch/pytorch/pull/32197.
In https://github.com/pytorch/pytorch/pull/32197, `rpc.sync_rpc(..) `and `rpc.rpc_async(..)` support taking a TorchScript annotated Python function as the user function for RPC.
This PR extend along this direction by making `rpc.remote(..)` support taking a TorchScript annotated Python function as well.
ghstack-source-id: 97211168
Test Plan:
# Unit tests
```
buck test mode/dev-nosan //caffe2/test/distributed/rpc:rpc_fork -- test_script_function_exception
buck build mode/dev-nosan //caffe2/test/distributed/rpc:rpc_fork
buck-out/gen/caffe2/test/distributed/rpc/rpc_fork\#binary.par -r test_script_function_exception
```
```
buck test mode/dev-nosan //caffe2/test/distributed/rpc:dist_autograd_fork -- test_backward_simple_script_call
buck build mode/dev-nosan //caffe2/test/distributed/rpc:dist_autograd_fork
buck-out/gen/caffe2/test/distributed/rpc/dist_autograd_fork\#binary.par -r test_backward_simple_script_call
```
Differential Revision: D19440633
fbshipit-source-id: d37f6dcdc0b80d35ac7bcba46ad6f9b831c3779b
