Made StandardMultilayerPBR hide a layer's property groups when that layer is disabled.

ATOM-14688 Disable Individual Layers

- Added new SetMaterialPropertyGroupVisibility functions to the material functors.
- Updated the MaterialFunctor::EditorContext to include parameters for handling material property group metadata.
- Updated the material inspector(s) to apply the property group visiblity changes from the material functor, to hide or show the property groups.
- Moved some code from MaterialPropertyDescriptor.h/cpp to a new MaterialDynamicMetadata.h/cpp, since these aren't really related to the MaterialPropertyDescriptor code. It's more for material functors to use.
- Also fixed the casing for the "GetMaterialPropertyValue_Image" lua function, since I was already in this code (ATOM-14793 "Fix Inconsistent Casing For LuaMaterialFunctorRuntimeContext")

Tested in MaterialEditor and in in the main Editor's MaterialComponent property override inspector.

Gems/Atom/Tools/AtomToolsFramework/Code/Source/Inspector/InspectorWidget.cpp

@@ -69,6 +69,7 @@ namespace AtomToolsFramework
         InspectorGroupHeaderWidget* groupHeader = new InspectorGroupHeaderWidget(m_ui->m_propertyContent);
         groupHeader->setText(groupDisplayName.c_str());
         groupHeader->setToolTip(groupDescription.c_str());
+        groupHeader->setObjectName(groupNameId.c_str());
         m_layout->addWidget(groupHeader);
         m_headers.push_back(groupHeader);
 
@@ -81,6 +82,32 @@ namespace AtomToolsFramework
             OnHeaderClicked(event, groupHeader, groupWidget);
         });
     }
+    
+    void InspectorWidget::SetGroupVisible(const AZStd::string& groupNameId, bool visible)
+    {
+        for (size_t i = 0; i < m_groups.size(); ++i)
+        {
+            if (m_groups[i]->objectName() == groupNameId.c_str())
+            {
+                m_headers[i]->setVisible(visible);
+                m_groups[i]->setVisible(visible && m_headers[i]->IsExpanded());
+                break;
+            }
+        }
+    }
+    
+    bool InspectorWidget::IsGroupVisible(const AZStd::string& groupNameId) const
+    {
+        for (auto& header : m_headers)
+        {
+            if (header->objectName() == groupNameId.c_str())
+            {
+                return header->isVisible();
+            }
+        }
+
+        return false;
+    }
 
     void InspectorWidget::RefreshGroup(const AZStd::string& groupNameId)
     {