Public C++ header files and samples updates (#819)

* Public C++ header files (source/include/rocprofiler-sdk/cxx)

* Update samples/api_buffered_tracing

- scratch memory and page migration
- README

* Update samples/api_buffered_tracing

- page migration component in sample

* Update tests/page-migration/validate.py

- fix checks for page migration operation names

* Update tests/page-migration/validate.py

- fix get_allocated_pages

* Update scratch memory and page migration validations

* Fix include/rocprofiler-sdk/cxx installation

* Rework include/rocprofiler-sdk/cxx

- Improve name_info to support const char*, string_view, string

* Update samples/api_{buffered,callback}_tracing

* External correlation ID request sample

- includes correlation ID retirement demo

* Update samples/api_buffered_tracing/README.md

* Update lib/rocprofiler-sdk/hsa/queue.cpp

- generate correlation ID for kernel launch if one doesn't exist

* Remove priority check from tool libraries (samples/tests)

- if(priority > 0) return nullptr check in rocprofiler_configure has proliferated beyond its intended use

* Apply suggestions from code review

source/docs/tool_library_overview.md

@@ -229,9 +229,6 @@ rocprofiler_configure(uint32_t                 version,
                       uint32_t                 priority,
                       rocprofiler_client_id_t* client_id)
 {
-    // If not first tool to register, indicate that the tool doesn't want to do anything
-    if(priority > 0) return nullptr;
-
     // (optional) Provide a name for this tool to rocprofiler
     client_id->name = "ExampleTool";