Support ROCP_TOOL_LIBRARIES env + librocprofiler-sdk.so (#48)

* Fix support for version in find_package(rocprofiler-register <version>)

* Update lib/rocprofiler-register/rocprofiler-register.cpp

- change rocprofiler library name to librocprofiler-sdk.so
- add helper function rocp_load_rocprofiler_lib for dlopen of rocprofiler library
- support ROCP_TOOL_LIBRARIES environment variable
- reworked rocprofiler_register_error_string

* Update tests/rocprofiler

- rename library to librocprofiler-sdk
- remove rocprofiler_configure within librocprofiler-sdk.so

* Add tests/generic-tool

- provides implementation of rocprofiler_configure

* Update tests/CMakeLists.txt

- use libgeneric-tool.so
- LD_PRELOAD libgeneric-tool.so instead of librocprofiler
- Add tests which use ROCP_TOOL_LIBRARIES

* Update tests/generic-tool/generic-tool.cpp

- include <cstdint>

tests/generic-tool/generic-tool.cpp

@@ -0,0 +1,46 @@
+
+#include <pthread.h>
+#include <cstdint>
+#include <stdexcept>
+#include <string_view>
+
+extern "C" {
+typedef struct
+{
+    const char*    name;    ///< clients should set this value for debugging
+    const uint32_t handle;  ///< internal handle
+} rocprofiler_client_id_t;
+
+typedef void (*rocprofiler_client_finalize_t)(rocprofiler_client_id_t);
+
+typedef int (*rocprofiler_tool_initialize_t)(rocprofiler_client_finalize_t finalize_func,
+                                             void*                         tool_data);
+
+typedef void (*rocprofiler_tool_finalize_t)(void* tool_data);
+
+typedef struct
+{
+    size_t                        size;        ///< in case of future extensions
+    rocprofiler_tool_initialize_t initialize;  ///< context creation
+    rocprofiler_tool_finalize_t   finalize;    ///< cleanup
+    void* tool_data;  ///< data to provide to init and fini callbacks
+} rocprofiler_tool_configure_result_t;
+
+rocprofiler_tool_configure_result_t*
+rocprofiler_configure(uint32_t, const char*, uint32_t, rocprofiler_client_id_t*)
+    __attribute__((visibility("default")));
+
+rocprofiler_tool_configure_result_t*
+rocprofiler_configure(uint32_t                 version,
+                      const char*              runtime_version,
+                      uint32_t                 priority,
+                      rocprofiler_client_id_t* tool_id)
+{
+    (void) version;
+    (void) runtime_version;
+    (void) priority;
+    (void) tool_id;
+
+    return nullptr;
+}
+}