Panzer: Add unique identifiers to worksets

[eric-c-cyr]

It would be good to have a unique identifier for each workset. This would be constructed from the WorksetDescriptor to be locally unique (with a set of Worksets defined by the descriptor). If you want a globally unique set of worksets, they could be constructed by a unordered_map.

[eric-c-cyr]

Is it clear how to convert in both directions Kokkos::DynRankView <=> PHX::MDFields?

[eric-c-cyr]

Also, I'm refactoring the PointValues2 class some to be more consistent with BasisValues2 and IntegrationValues2. As part of that I'm going to collapse the NODE tag into the BASIS tag. Anyone see a problem with this? Clearly this will require testing.

[eric-c-cyr]

In retrospect, I don't have to do change NODE to BASIS, though I could if people think its a good idea.

[rppawlo]

I like the idea of changing node to basis. One less branch for possible divergence/code duplication.

[eric-c-cyr]

Alright @rppawlo, my next merge commit will do this. Basically, NODE will be aliased to BASIS. We can do the sed script to totally eliminate it after that.

[eric-c-cyr]

There are a few things to be done first before the core of this issue:

• Add point descriptor
• Convert point values to be more like basis values (no longer dependent on a templated array type, going straight to MDField)
• Add point values to workset for evaluation of basis points
• Add unique identifier to workset