[2/N] Agent Counter implementation with unit tests to check functionality (#846)

Agent Counter Collection API with tests and samples.
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Co-authored-by: Benjamin Welton <ben@amd.com>

source/lib/rocprofiler-sdk/registration.cpp

@@ -748,6 +748,9 @@ rocprofiler_set_api_table(const char* name,
         // need to construct agent mappings before initializing the queue controller
         rocprofiler::agent::construct_agent_cache(hsa_api_table);
         rocprofiler::hsa::queue_controller_init(hsa_api_table);
+        // Process agent ctx's that were started prior to HSA init
+        rocprofiler::counters::agent_profile_hsa_registration();
+
         rocprofiler::hsa::async_copy_init(hsa_api_table, lib_instance);
         rocprofiler::code_object::initialize(hsa_api_table);