[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/RPI/Code/Source/RPI.Public/Image/ImageSystem.cpp

@@ -34,6 +34,8 @@
 #include <AzCore/Asset/AssetManager.h>
 #include <AzCore/Math/Color.h>
 
+AZ_DECLARE_BUDGET(RPI);
+
 namespace AZ
 {
     namespace RPI
@@ -171,7 +173,7 @@ namespace AZ
 
         void ImageSystem::Update()
         {
-            AZ_ATOM_PROFILE_FUNCTION("RPI", "ImageSystem: Update");
+            AZ_PROFILE_SCOPE(RPI, "ImageSystem: Update");
 
             AZStd::lock_guard<AZStd::mutex> lock(m_activeStreamingPoolMutex);
             for (StreamingImagePool* imagePool : m_activeStreamingPools)