Merge pull request #1605 from CEED/jrwrigh/idl_explicit

fluids: Add IDL to RHSFunction_Newtonian

test(fluids): Modify test for IDL explicit

- Repurposing the Gaussian wave explicit test to also include IDL
testing
- Also modify the Advection skew tolerance slightly to pass on my local
machi

test(fluids): Modify test for IDL explicit

- Repurposing the Gaussian wave explicit test to also include IDL
testing
- Also modify the Advection skew tolerance slightly to pass on my local
machine (failed with 5.076e-10 on the avx/blocked backend)

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Merge pull request #1553 from CEED/jrwrigh/ns_stabilized_mass

fluids: Add stabilized mass operator for Newtonian

test(fluids): Test newtonian stabilized mass

Merge pull request #1539 from CEED/jrwrigh/explicit_ns

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

test(fluids): Add explicit NS test