Terrain Physics Heightfield support

* New Heightfield Components

Signed-off-by: John Jones-Steele <jjjoness@amazon.com>

* Misc PR fixes
* Fixed linux build failure from bad #include
* Renamed "Terrain Physics Collider" to "Terrain Physics Heightfield Collider" per physics team feedback
* Fixed 1/5 -> 1/4 typo in a comment
* Added missing member copies in HeightfieldShapeConfiguration

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

* Addressed PR feedback

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

* Changes from review

Signed-off-by: John Jones-Steele <jjjoness@amazon.com>

* Remove tabs accidently added

Signed-off-by: John Jones-Steele <jjjoness@amazon.com>

* Fixed overly complicated scaling math.

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

* Added comments to make it more obvious what's happening on CreateEnd / DestroyBegin.

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

* Moved Heightfield CreatePxGeometryFromConfig into its own function

Signed-off-by: John Jones-Steele <jjjoness@amazon.com>

Co-authored-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

Gems/PhysX/Code/Source/EditorComponentDescriptors.cpp

@@ -12,6 +12,7 @@
 #include <Source/EditorColliderComponent.h>
 #include <Source/EditorFixedJointComponent.h>
 #include <Source/EditorForceRegionComponent.h>
+#include <Source/EditorHeightfieldColliderComponent.h>
 #include <Source/EditorHingeJointComponent.h>
 #include <Source/EditorJointComponent.h>
 #include <Source/EditorRigidBodyComponent.h>
@@ -35,6 +36,7 @@ namespace PhysX
             EditorColliderComponent::CreateDescriptor(),
             EditorFixedJointComponent::CreateDescriptor(),
             EditorForceRegionComponent::CreateDescriptor(),
+            EditorHeightfieldColliderComponent::CreateDescriptor(),
             EditorHingeJointComponent::CreateDescriptor(),
             EditorJointComponent::CreateDescriptor(),
             EditorRigidBodyComponent::CreateDescriptor(),