[1/N] Agent Counter Collection Implementation (#832)

Added public API call to setup agent counter collection on a context.

Refactored the return types internally for dispatch counter collection
to use rocprofiler_status_t (allow for more verbose failures to be
surfaced via the API)

Subsequent commits will fill out the sampling functionality for agent
counter collection.

Co-authored-by: Benjamin Welton <ben@amd.com>

source/include/rocprofiler-sdk/rocprofiler.h

@@ -65,7 +65,7 @@ ROCPROFILER_EXTERN_C_FINI
 /** @} */
 
 #include "rocprofiler-sdk/agent.h"
-// #include "rocprofiler-sdk/agent_profile.h"
+#include "rocprofiler-sdk/agent_profile.h"
 #include "rocprofiler-sdk/buffer.h"
 #include "rocprofiler-sdk/buffer_tracing.h"
 #include "rocprofiler-sdk/callback_tracing.h"