Terrain/sphrose/surface materials component (#4541)

* wip

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* wip

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Terrain Surface Materials List Component.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* fix erroneous commit

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Added some comments.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Review changes.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Surface Materials list unit tests

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Missing shape test

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* review changes.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Compile fix.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

* Fix case issue in include path.

Signed-off-by: Ken Pruiksma <pruiksma@amazon.com>

* replaced reverted test.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

Co-authored-by: Ken Pruiksma <pruiksma@amazon.com>

Gems/Terrain/Code/Source/TerrainModule.cpp

@@ -18,6 +18,7 @@
 #include <Components/TerrainLayerSpawnerComponent.h>
 #include <Components/TerrainSurfaceGradientListComponent.h>
 #include <Components/TerrainSurfaceDataSystemComponent.h>
+#include <TerrainRenderer/Components/TerrainSurfaceMaterialsListComponent.h>
 #include <TerrainRenderer/Components/TerrainMacroMaterialComponent.h>
 
 namespace Terrain
@@ -26,6 +27,7 @@ namespace Terrain
         : AZ::Module()
     {
         m_descriptors.insert(m_descriptors.end(), {
+                TerrainSurfaceMaterialsListComponent::CreateDescriptor(),
                 TerrainSystemComponent::CreateDescriptor(),
                 TerrainWorldComponent::CreateDescriptor(),
                 TerrainWorldDebuggerComponent::CreateDescriptor(),