feat: Immiscible water model

[dkachuma]

Completes the water on the immiscible water model. This defines a compositional fluid model in which the water component does not participate in the flash but instead makes up it's own 3rd water/aqueous phase which is immiscible with the other 2 phases.

The phase partition is done via ImmiscibleWaterFlash. This removes the water component for the negative two phase flash of the "hydrocarbon" phases and reconstitutes the result into 3 phases.

The water properties (density and viscosity) are by providing reference values at a reference pressure and temperature and providing a compressibility and a thermal expansion coefficient.