BHoM_Engine: refactor numerical approximation methods to use a new `NumericalApproximationConfig` input

#### Description:

By introducing a new `NumericalApproximationConfig` class (see https://github.com/BHoM/BHoM/issues/1591) we can improve clarity on the usage of BHoM_Engine methods for numerical approximation that currently take a BaseComparisonConfig as an input, but only use its numerical approximation properties (e.g. [`NumericalApproximation()`](https://github.com/BHoM/BHoM_Engine/blob/86f447c44bbbf642db2f6bf8378d052e4ebee1f6/BHoM_Engine/Query/NumericalApproximation.cs#L49-L54)).

These can be refactored to take as input this new `NumericalApproximationConfig` instead, making them more flexible and reusable in different contexts.