[CL] Output kinetic reactant onto the element level
KineticReactant::Amount lives on the integration points. For this reason, the output of
KineticReactant::Amount is stored in the FieldData, which brings out inconvenience to contour the field of
KineticReactant::Amount. With the changes of this pull request,
KineticReactant::Amount is averaged over integration points of an element, and its output is stored in the CellData.
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