Kokkos Multivariable Kernels

[NamjaeChoi]

Refs #30655.

Multivariable kernels are different from vector or array kernels. It works by simply specifying variables instead of variable to existing kernels. This concept allows consolidating multiple same kernels operating on different standard variables into a single kernel and provides additional parallelism over the variables. This is considered useful for certain applications like neutronics, where the same kernel applies to multiple flux variables representing each energy group. Using array variables for this makes it cumbersome to access each component (group).

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• framework
• chemical_reactions
• combined
• contact
• electromagnetics
• external_petsc_solver
• fluid_properties
• fsi
• functional_expansion_tools
• geochemistry
• heat_transfer
• level_set
• misc
• navier_stokes
• optimization
• peridynamics
• phase_field
• porous_flow
• ray_tracing
• rdg
• reactor
• richards
• scalar_transport
• solid_mechanics
• solid_properties
• stochastic_tools
• subchannel
• thermal_hydraulics
• xfem

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[NamjaeChoi]

Just realized that MOOSE assumes each object operates on a single variable in a lot of places...

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