check in lib file for now and throw it in the pip install (#15713)

the .lib file comes from compiling aoti_cuda_shims on windows. Ideally
we will not check this in but rather cross compile it on the fly from
linux. Thats coming soonish.

We need the .lib file in order to lower for cuda windows backend. Cuda
windows uses AOTI as the acceleration lib, AOTI generates executable
code that calls into the shim. On windows you must provide a reference
to all symbols you will link against (unlike linux) so we need the .lib
artifact.

Author: JacobSzwejbka

backends/cuda/runtime/aoti_cuda_shims.lib

@@ -918,5 +918,11 @@ def run(self):  # noqa C901
             is_dynamic_lib=True,
             dependent_cmake_flags=["EXECUTORCH_BUILD_KERNELS_LLM_AOT"],
         ),
+        BuiltFile(
+            src_dir="backends/cuda/runtime/",
+            src_name="aoti_cuda_shims.lib",
+            dst="executorch/data/lib/",
+            dependent_cmake_flags=[],
+        ),
     ],
 )