feat: add PartialDerivative#341
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The feature is limited to 0-forms defined on Cartesian geometries.
The previous version was not correct for `FormField`s.
Change from an error to a warning if geometry is not Cartesian.
Summary of changes: - introduce a new structure `PartialOrder`; allows dispatching on the total derivative order, which is useful for logic and optimisation. - introduce general method for arbitrary geometries if the total derivative order is 1. - specialise computations for `CartesianGeometry`.
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Summary of changes: - Throw error for the geometric scaling of an abstract geometry; the implementation is not correct. A correct implementation would requiring mixing derivatives, which is not done currently. Requires a vector field structure. - Allow bypass of incorrect method for `HierarchicalGeometry`, if said geometry is built only on `CartesianGeometry`.
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Introduces the
PartialDerivative. This structure enables the computation of partial derivatives of 0-forms defined over aCartesianGeometry, while preserving the form rank.