Allow extra parameters for fluid models

[dkachuma]

This PR addresses one of the outstanding items from #2879. It adds xml changes to allow the user to specify some fluid parameters.

This is done generically for current (and future) fluid models. The ModelParameters class is added as a generic unspecified base class that contains specific model parameters for a specific model. If a fluid model requires additional parameters:

• The ModelParameters class should be extended to include the new parameters.
• The registerParametersImpl method allows these parameters to be registered on the CompositionalFluidModel class.
• The postProcessInputImpl is a callback to instantiate/validate the parameters.
• The model class should then provide a static createParameters to create an instance of this extended class.

This is done for the specific cases:

• ConstantViscosity: Specifies an array of constant viscosity for each phase.
• LohrenzBrayClarkViscosity: Specifies the mixing rule to be used for phase viscosity. The component critical volume is currently only required for this model. So it is moved from ComponentProperties.

The standard compositional fluid model parameters are now owned by the ComponentProperties object.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 28.04878% with 118 lines in your changes missing coverage. Please review.

Project coverage is 56.45%. Comparing base (880d43c) to head (c0a1a79).

Files	Patch %	Lines
...uid/compositional/CompositionalMultiphaseFluid.cpp	0.00%	43 Missing :warning:
...tifluid/compositional/models/ConstantViscosity.cpp	0.00%	25 Missing :warning:
...compositional/models/LohrenzBrayClarkViscosity.cpp	42.10%	22 Missing :warning:
...ultifluid/compositional/models/ModelParameters.hpp	30.00%	14 Missing :warning:
...uid/multifluid/compositional/models/PhaseModel.hpp	0.00%	6 Missing :warning:
...tifluid/compositional/models/ConstantViscosity.hpp	0.00%	3 Missing :warning:
...compositional/models/LohrenzBrayClarkViscosity.hpp	33.33%	2 Missing :warning:
...luid/multifluid/compositional/models/NullModel.hpp	0.00%	2 Missing :warning:
...ompositional/models/NegativeTwoPhaseFlashModel.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3157 +/- ## =========================================== - Coverage 56.49% 56.45% -0.04% =========================================== Files 1021 1022 +1 Lines 86339 86421 +82 =========================================== + Hits 48775 48792 +17 - Misses 37564 37629 +65 ```

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