Add bootstrap kernel

This is not a compliant kernel at all, no ABI3, etc. Just an initial
upload so that we can start with support in `kernels`.

build/torch27-metal-arm64-darwin/relu_metal/_C.cpython-312-darwin.so

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f59bb8826eb4974df9653a2ca5e239b467ffde37d210b4c5025c471201548d57
+size 91816

build/torch27-metal-arm64-darwin/relu_metal/_C.cpython-313-darwin.so

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f59bb8826eb4974df9653a2ca5e239b467ffde37d210b4c5025c471201548d57
+size 91816

build/torch27-metal-arm64-darwin/relu_metal/__init__.py

@@ -0,0 +1,7 @@
+import torch
+
+from ._ops import ops
+
+
+def relu(input: torch.Tensor) -> torch.Tensor:
+    return ops.relu(input)

build/torch27-metal-arm64-darwin/relu_metal/_ops.py

@@ -0,0 +1,4 @@
+import torch
+from . import _C
+
+ops = torch.ops._C