Move backward compatibility code for dict set-state from PyFluent to settings API

[mkundu1]

The backward compatibilty while setting state with a dictionary is handled in the following way in PyFluent:

Suppose, a is group, x is an child-alias of a pointing to some relative path b which may or may not be inside a. We want to do a set-state at a with the dictionary {"x": .., ..}. The dictionary is transformed to convert key "x" to key "b" (which can be at a different level) before sending it to settings API. If b is outside a, the whole this is resolved to a set-state outside a. We want to move this state-transformation code to settings API. PyFluent will just pass {"x": .., ..} to the settings API with "x" converted to its original scheme-name.

PyFluent doesn't yet handle the scenario when a is a named object. Resolving "x" within PyFluent is problematic in that scenario as "x" can be a part of a state which is not created yet which means we cannot traverse the object-hierarchy. Note that, PyFluent class-hierarchy cannot provide child -> parent link.