TS ex11: - Added a new macro `zero` with the value 0.0. - Modified the function `PhysicsRiemann_SW_Rusanov` to handle negative heights. - Replaced a block of code that printed debug information with a simpler implementation using the `zero` macro. <Move these> - Added a new variable `strides` to store stride values,  previous used CEED default type. - Modified the call to `CeedElemRestrictionCreateStrided` to use the `strides` array.