add a test for clSetContextDestructorCallback (#861)

* add a test for clSetContextDestructorCallback

* add a 10 second timeout for mem object and context destructor callbacks

* clang-format fixes

* address review comments

test_conformance/api/CMakeLists.txt

@@ -27,6 +27,7 @@ set(${MODULE_NAME}_SOURCES
          test_sub_group_dispatch.cpp
          test_clone_kernel.cpp
          test_zero_sized_enqueue.cpp
+         test_context_destructor_callback.cpp
 )
 
 include(../CMakeCommon.txt)