[development] Migrated Atom CPU profiler to utilize new AzCore Profiler interface and related macros (#4160)

- Added new interface type AZ::Debug::Profiler to externally register profiler systems
 - Modified the Atom CPU profiler to register as an AzCore profiler
 -- This allows full engine markers to be visualized in the associated ImGui tool
 - Converted all AZ_ATOM_PROFILE_* macros to use AZ_PROFILE_* macros instead

Signed-off-by: AMZN-ScottR 24445312+AMZN-ScottR@users.noreply.github.com

Gems/Atom/Feature/Common/Code/Source/AuxGeom/FixedShapeProcessor.cpp

@@ -108,8 +108,8 @@ namespace AZ
         }
 
         void FixedShapeProcessor::PrepareFrame()
-        {            
-            AZ_ATOM_PROFILE_FUNCTION("AuxGeom", "FixedShapeProcessor: PrepareFrame");
+        {
+            AZ_PROFILE_SCOPE(AzRender, "FixedShapeProcessor: PrepareFrame");
             m_processSrgs.clear();
             m_drawPackets.clear();
 
@@ -127,8 +127,7 @@ namespace AZ
 
         void FixedShapeProcessor::ProcessObjects(const AuxGeomBufferData* bufferData, const RPI::FeatureProcessor::RenderPacket& fpPacket)
         {
-            AZ_PROFILE_FUNCTION(AzRender);
-            AZ_ATOM_PROFILE_FUNCTION("AuxGeom", "FixedShapeProcessor: ProcessObjects");
+            AZ_PROFILE_SCOPE(AzRender, "FixedShapeProcessor: ProcessObjects");
 
             RHI::DrawPacketBuilder drawPacketBuilder;