Contexts update + buffer flushing + cleanup (#338)

* Update lib/rocprofiler-sdk/context/context.*

- get_registered_contexts functions (local copy)

* Update lib/rocprofiler-sdk/hsa/{queue,queue_controller}.cpp

- remove ROCPROFILER_BUFFER_TRACING_MEMORY_COPY code

* Update tests/kernel-tracing/kernel-tracing.cpp

- move stop() and flush() in tool_fini to before reporting of sizes of data collected

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

- remove stale set_callback / activity_functor_t code

* Update lib/rocprofiler-sdk/buffer.cpp

- full wait instead of returning busy when buffer is busy
- use task_group::join instead of task_group::wait to fully wait for tasks to finish (bug fix)

* Update lib/rocprofiler-sdk/agent.cpp

- support agent mapping for CPU agents

* Remove direct access to vector of registered contexts

source/lib/rocprofiler-sdk/callback_tracing.cpp

@@ -88,12 +88,7 @@ rocprofiler_configure_callback_tracing_service(rocprofiler_context_id_t
     if(rocprofiler::registration::get_init_status() > -1)
         return ROCPROFILER_STATUS_ERROR_CONFIGURATION_LOCKED;
 
-    if(context_id.handle >= rocprofiler::context::get_registered_contexts().size())
-    {
-        return ROCPROFILER_STATUS_ERROR_CONTEXT_NOT_FOUND;
-    }
-
-    auto& ctx = rocprofiler::context::get_registered_contexts().at(context_id.handle);
+    auto* ctx = rocprofiler::context::get_mutable_registered_context(context_id);
 
     if(!ctx) return ROCPROFILER_STATUS_ERROR_CONTEXT_NOT_FOUND;