ATOM-16237 Using setting registry to RPI system settings (#3663)

* ATOM-16237 Using setting registry to RPI system settings
Changes include:
- Remove RHISystemDesriptor since the pre-registered draw list tag is not needed.
- Remove EitorContext which was for system component settings.
- Add atom_rpi.setreg file
- Add getting RPISystemDescriptor from setting registry.

Signed-off-by: qingtao <qingtao@amazon.com>

Gems/Atom/RPI/Code/Include/Atom/RPI.Reflect/Image/ImageSystemDescriptor.h

@@ -21,8 +21,16 @@ namespace AZ
             AZ_TYPE_INFO(RPI::ImageSystemDescriptor, "{319D14F6-F7F2-487A-AA6B-5800E328C79B}");
             static void Reflect(AZ::ReflectContext* context);
 
+            //! The maximum size of the image pool used for system streaming images.
+            //! Check ImageSystemInterface::GetSystemStreamingPool() for detail of this image pool
             uint64_t m_systemStreamingImagePoolSize = 128 * 1024 * 1024;
+
+            //! The maximum size of the image pool used for system attachments images.
+            //! Check ImageSystemInterface::GetSystemAttachmentPool() for detail of this image pool
             uint64_t m_systemAttachmentImagePoolSize = 512 * 1024 * 1024;
+
+            //! The maximum size of the image pool used for streaming images load from assets
+            //! Check ImageSystemInterface::GetStreamingPool() for detail of this image pool
             uint64_t m_assetStreamingImagePoolSize = 2u * 1024u * 1024u * 1024u;
         };
     } // namespace RPI

Gems/Atom/RPI/Code/Include/Atom/RPI.Reflect/RPISystemDescriptor.h

@@ -10,7 +10,6 @@
 
 #include <Atom/RPI.Reflect/GpuQuerySystemDescriptor.h>
 #include <Atom/RPI.Reflect/Image/ImageSystemDescriptor.h>
-#include <Atom/RHI.Reflect/RHISystemDescriptor.h>
 
 namespace AZ
 {
@@ -31,8 +30,6 @@ namespace AZ
             AZ_TYPE_INFO(RPISystemDescriptor, "{96DAC3DA-40D4-4C03-8D6A-3181E843262A}");
             static void Reflect(AZ::ReflectContext* context);
 
-            RHI::RHISystemDescriptor m_rhiSystemDescriptor;
-
             //! The asset cache relative path of the only common shader asset for the RPI system that is used
             //! as means to load the layout for scene srg and view srg. This is used to create any RPI::Scene.
             AZStd::string m_commonSrgsShaderAssetPath = "shader/sceneandviewsrgs.azshader";