fluids: Change SGS IFunctionApply to use NewtonianIdealGasContext

- It doesn't need anything more than that

fluids: Create generic SGS DD eval interface

- Existing implementation now called "Fused" evaluation

fluids: Use utility for velocity gradient projection

- Evidentily missed this one when I added
StatePhysicalGradientFromReference awhile back. Or this was on a
longer lived branch that got me

fluids: Use utility for velocity gradient projection

- Evidentily missed this one when I added
StatePhysicalGradientFromReference awhile back. Or this was on a
longer lived branch that got merged out-of-order

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fluids: Merge 2D and 3D advection setup

Instead of `-problem advection` and `-problem advection2d`, there's just
`-problem advection` and the dimensionality is taken from the dm.

fluids: Generalize advection boundary qfunctions

fluids: Packing routines for 2D boundary setup

fluids: Generalize advection RHSFunction for 2d and 3d

fluids: Convert strong_form to boolean in advection

fluids: Generalize advection IFunction for 2d and 3d

fluids: Change 2D qdata to use unpacking routines

fluids: Generalize advection IC for 2d and 3d

fluids: Create generic MatMatN for square matrices

MatMat3 now uses MatMatN

fluids: Convert IFunction_Advection to state structs

fluids: Minor stabilization refactor

fluids: Change skew advection threshold

3rd order requires a 20 CEED_EPSILON instead of just 5

fluids: Refactor diagonal tau calculation

Also correct documentation of tau calculation

fluids: Cleanup misc math

fluids: Change bubble_type to advection_ic_type

Since cosine_hill and skew aren't bubbles

fluids: Add in cosine hill and skew advection ICs

fluids: Ensure all outputs are set in QFunctions

- In support of #1420

fluids: Add SGS DD training QFunctions

- Returns training data

fluids: Move diff filter enums to separate header file

- So that other QFunctions can use them for indexing into differential
filtered fields

fluids: Agnosticize VeloGradient projection setup

- It can now setup more than just user->grad_velo_proj

fix(fluids): Remove BUBBLE_COSINE

- left over from new feature

Merge pull request #1399 from CEED/jrwrigh/advection_cleanup

fluids: Cleanup advection problems