Add reusable libCEED point evaluation substrate - #851
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This is 2/10 in the stacked replacement for #824/#825 and depends on #850. Please review only the diff against that PR.
This adds reusable libCEED basis, functional, and grouped-operator infrastructure for evaluating fields at fixed points, then uses it for probe interpolation.
Reviewer guidance: Start with
fem/libceed/{basis,functional}.*andceed_group_operator.*;interpolator.cppis the first concrete consumer. The ownership and cache lifetimes introduced here are the contracts used by the rest of the stack.Deferred: Variable per-element points, face-neighbor exchange, and surface reductions are intentionally later.
Validation: Probe tests pass serial and MPI-2: 396 assertions each.