fluids: Add Entropy state variable and tests

Co-authored-by: Zach Atkins <zacharyjayhawk@gmail.com>

fluids: Add PyTorch external DD SGS evaluation

- Rename sequential_internal -> *_ceed

fluids: Add IDL to RHSFunction_Newtonian

fluids: Add QDataGet functions

fluids: Use StatePrimitive in blasius context

fluids: Add diffusion to advection problem

Merge pull request #1553 from CEED/jrwrigh/ns_stabilized_mass

fluids: Add stabilized mass operator for Newtonian

fix(fluids): Renable SmartSim testing and fix bug

- Fixed bug in sgs_dd_train QF, left over from debugging
- SmartSim tests were previously not running at all, due to
junit.py checking if `SMARTRE

fix(fluids): Renable SmartSim testing and fix bug

- Fixed bug in sgs_dd_train QF, left over from debugging
- SmartSim tests were previously not running at all, due to
junit.py checking if `SMARTREDIS_DIR` was a file instead of a
directory

Co-authored-by: James Wright <james@jameswright.xyz>

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refactor(fluids): Use QdataUnpack in Newtonian RHS

fluids: Add stabilized mass matrix to newtonian

Testing with:
```
build/fluids-navierstokes -options_file ./examples/fluids/gaussianwave.yaml -dm_plex_box_faces 10,10,1 -ts_max_steps 500 -degree 2

fluids: Add stabilized mass matrix to newtonian

Testing with:
```
build/fluids-navierstokes -options_file ./examples/fluids/gaussianwave.yaml -dm_plex_box_faces 10,10,1 -ts_max_steps 500 -degree 2 -implicit false -ts_type rk -stab supg -ts_dt 1e-4 -implicit false -ts_monitor_solution cgns:gaussian_wave.cgns -ts_monitor_solution_interval 5 -ts_view -state_var conservative -mass_ksp_type gmres -ts_monitor -mass_pc_type jacobi -mass_pc_jacobi_type diagonal
```

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fluids: Add stabilized mass for advection

This enables "full" SUPG for the advection problem using explicit time
integrators

fix(fluids): Allow advection to work with SYCL backends

refactor(fluids): Make QF comments consistent

See discussion: https://github.com/CEED/libCEED/pull/1539#discussion_r1548312418

fluids: Misc style changes

fluids: Make BCs compatible with explicit TS

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all sin

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all singly included headers

* jit - drop most guards on backend JiT files

* sycl - drop extra header guards

* jit - enable #pragma once for QF source

* fluids - use #pragma once for util/helper qf source

* test - check different multiple includes

* fluids - fix odd include

* jit - update interface for building JiT string from multiple files

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minor - update copyright headers

fluids: Test zbox in SmartSim test

This tests whether the output training data handles multiplicity
correctly. And also is the first fluids test with zbox.

fluids: Add GetInverseMultiplicity

fix(fluids): RHS stabilization term should be negative

fluids: Add different tau choices for advection

fluids: Implement bc_slip

This is a weak version of slip boundary condition based on a Riemann
solve

fluids: Implement sequential SGS DD eval

fluids: Add QFs for external SGS DD evaluation

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an is

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an isotropic model later, we
can give that the "Isotropic" qualifier on it's function names
- Remove the "Model" qualifier from function names. "SgsDD" is
communicative enough (Subgrid-stress inherently means a model)

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