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

samples/external_correlation_id_request/README.md

@@ -0,0 +1,24 @@
+# External Correlation ID Request Sample
+
+## Services
+
+- Code object callback tracing for mapping kernel IDs to kernel names
+- HIP Runtime API:
+  - hipLaunchKernel
+  - hipMemcpyAsync
+  - hipMemsetAsync
+  - hipMalloc
+- Kernel dispatch
+- Memory Copy
+- External correlation ID request:
+  - Kernel dispatch
+  - Memory copy
+- Correlation ID retirement
+
+## Properties
+
+- Subscribes to an external correlation ID request for all kernel dispatches and async memory copies
+- Generates an external correlation ID containing all the arguments passed to the request callback
+- Demonstrates that all external correlation IDs which are requested are passed back to tool in buffer callbacks
+- Demonstrates that all internal correlation IDs which are provided as an input argument to request are retired
+- Buffer size of 4096 bytes which is automatically flushed once >= 87.5% of buffer is filled (3584 bytes)