Connect prims.copy_with_setitem to nvFuser's Executor

[kevinstephano]

🚀 Feature

lightning-thunder/thunder/core/prims.py

Lines 3465 to 3470 in bed8e73

	def copy_with_setitem_meta(a: TensorProxy, index, value: TensorProxy) -> TensorProxy:
	# TODO: port checks from clang, currently there because of the utilities they need
	return TensorProxy(like=a)
	copy_with_setitem = make_prim(PrimIDs.COPY_WITH_SETITEM, "copy_with_setitem", meta=copy_with_setitem_meta)

It would be good to connect prims.copy_with_setitem to nvFuser's executor. How is setitem supposed to be implemented?

Motivation

Would help reduce the exposure of Thunder overheads for the execution of individual operations.

cc @tfogal