New support needed to pull back Bar results from Lusas 21

[EmmaSander]

Description:

<In Lusas 21 beam and bar results are separated, so when pulling back results from Lusas all axial elements forces are set to zero.>

Steps to reproduce:

Expected behaviour:

Test file(s):

[peterjamesnugent]

As discussed @EmmaSander here are is the relevant file:
https://github.com/BHoM/Lusas_Toolkit/blob/develop/Lusas_Adapter/CRUD/Read/Results/BarResults.cs

I think we need to create a List<string> for the entities to include "Force - Bar" and then we can just iterate the GetResultsSet() as no element can have results in each (as it can only own one mesh type in Lusas).