fluids: Make ProblemData a pointer to struct

We basically use it as a pointer-to-struct type everywhere, so might as
well make it consistent with everything else

Merge pull request #1559 from CEED/jrwrigh/fix_memory_leaks

fix(fluids): Fix primary PETSc memory leak, others

fix(fluids): Fix primary PETSc memory leak, others

All the memory leaks reported in regression tests via `-malloc_dump`
are now related to the boundary conditions and their handling of
QFunctionCont

fix(fluids): Fix primary PETSc memory leak, others

All the memory leaks reported in regression tests via `-malloc_dump`
are now related to the boundary conditions and their handling of
QFunctionContexts, which is a much more difficult problem and will be
addressed later.

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Merge pull request #1543 from CEED/jrwrigh/explicit_stabilized_mass

Fluids: Add stabilized mass operator for advection problem

fluids: Add stabilized mass for advection

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

Merge pull request #1539 from CEED/jrwrigh/explicit_ns

fluids: Make Newtonian BCs compatible with explicit timestepping, add test

Merge pull request #1549 from CEED/jrwrigh/fix_stg_explicit

fluids: Enable Ceed-based strong BCs for explicit methods

fluids: Make BCs compatible with explicit TS

fix(fluids): Enable strong STG for explicit timestepping

Also add error catching if SGS is requested for explicit; it's not
implemented at the moment.

Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

Merge pull request #1517 from CEED/jrwrigh/ratel_sync

fluids: Sync with Ratel changes

fluids: Sync with Ratel, get ceed-utils.h

Merge pull request #1510 from CEED/jrwrigh/fluids_matceed

fluids: Add MatCeed

fluids: Use MatCeed for Jacobian

Merge pull request #1443 from CEED/jrwrigh/riemann_slip

fluids: Change slip boundary condition formulation

fluids: Implement bc_slip

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

Merge pull request #1361 from CEED/jrwrigh/external_sgs

fluids: Add external SGS DD inference capability

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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Merge pull request #1422 from CEED/jrwrigh/strict_memcheck

fluids: Ensure all outputs are set in QFunctions

fluids: Add uses_newtonian flag

Merge pull request #1203 from CEED/jrwrigh/smartsim

fluids: SmartSim Online Data-Driven SGS training

fluids: Add -sgs_train_enable flag

fluids: Add data-driven SGS training setup, TSMonitor

- Adds `smartsim_weak.c` to handle case where SmartRedis is not built

Merge pull request #1399 from CEED/jrwrigh/advection_cleanup

fluids: Cleanup advection problems