fluids: Make STG QFs primitive compatible

fluids: Make newtonian boundary QFs primitive compatible

fluids: Change newt->primitive to is_primitive

Fluids - Newtonian with Primitive variables (#1011)

* Fluids - Initial commit for Newtonian primitive variables

* Fluids - include A0 (dU/dY) in the output

* Fluids - added ICs for IG in primi

Fluids - Newtonian with Primitive variables (#1011)

* Fluids - Initial commit for Newtonian primitive variables

* Fluids - include A0 (dU/dY) in the output

* Fluids - added ICs for IG in primitive variables

* Fluids - added Jacobean QFunction for primitive variables

* Fluids - added RHS QFunction for primitive variables

* Fluids - fixed compilation errors and warnings

* Fluids - added ICs for density_current with primitive variables

* Fluids - In/OutFlow BCs for channel in primitive variables

* Adding the missing parts after rebasing onto main

* Fluids - Use correct component names for primitive variables

* Fluids - Primitive variables supported only with implicit scheme

* Fluids - drop in/outflow for channel flow and call Exact_Channel_Prim() in Exact_Channel()

* Fluids - Set solver's QFunction data in an if-else statement

* Fluids - style

* Fluids - add a comment to explain why the the gravity body force is excluded from the potential energy.

* Fluids - Exact_Channel return State

* Fluids - density_current: some style and cleanup

* Fluids - DC: refactor & cleanup

* Fluids - Singel QFunction for prim&cons

* Fluids - Use absolute temperature

* Fluids - DC: Fix pressure

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fluids: Store 1/Ektot

fluids: Implement stgdata for ektot

fluids: Add STG Preprocessing and Calc QFs

fluids: Abstract out spectrum calculation

fluids: Minor improvements for dirichlet and stg

fluids: Set all outputs in STG QF

fluids: Create QFs for strong STG w/ QFunctions

fluids: Combine misc QF helpers into utils.h

fluids: Add missing license boilerplate

examples/fluids: Add STGInflow Jacobian QFunction

examples/fluids: Protect against divide-by-0

- When running with strong enforced stg, the spectrum calc can try and
divide by 0 (distance to the wall)
- This behavior doesn't break anything per

examples/fluids: Protect against divide-by-0

- When running with strong enforced stg, the spectrum calc can try and
divide by 0 (distance to the wall)
- This behavior doesn't break anything persay, but this commit makes it
much easier to debug floating point exceptions.

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examples/fluids: ICs from STG Profile

examples/fluids: Viscous flux for BoundaryIntegral jacobian

examples/fluids: Add viscous flux to POutflow Jacobian

examples/fluids: Move POutflow_Jac to State variables

- Verified to be exactly the same as before, just using the State
structs and methods

examples/fluids: Add viscous flux to StrongInflowBI

examples/fluids: Add viscous flux to POutflow BC

examples/fluids: Move blasius outflow to newtonian.h

examples/fluids: Move StrongSTGbcFunc to newtonian.h

- Requires significant changes to how the stg_context is passed to the
the strong bc

examples/fluids: Abstract State and helper funcs

examples/fluids: Pass solution gradient to boundary QFs