add a host task emulation layer and sample

Author: bashbaug

layers/12_hosttaskemu/CMakeLists.txt

@@ -0,0 +1,9 @@
+# Copyright (c) 2025 Ben Ashbaugh
+#
+# SPDX-License-Identifier: MIT
+
+add_opencl_layer(
+    NUMBER 12
+    TARGET HostTaskEmu
+    VERSION 300
+    SOURCES main.cpp emulate.cpp emulate.h)