Fix TensorWrapper

[ryanmrichard]

Changes to ParallelZone broke TensorWrapper. In particular:

• PZ's RuntimeView should be updated to accept initialization/finalization callbacks
• TensorWrapper should be updated to pass TA's initialization/finalization functions to RuntimeView

[yzhang-23]

The questions I need to answer in order to fix this issue are summarized as the following:

1. Should we introduce initialization/finalization callbacks into the RuntimeView class in ParallelZone? Why do we need callbacks here? I should compare the cases with/without initialization/finalization callbacks.
2. If the answer to Q1 is "yes", how to introduce initialization/finalization callbacks into the RuntimeView class? Introducing callbacks in ctors is easy, but is there a way to also introduce callbacks into dtors (under investigation)?
3. Is it advantageous to write an initialize wrapper for every downstream repo beyond ParallelZone (open for discussion)?

[ryanmrichard]

These questions really pertain to ParallelZone and should be tackled there.

[ryanmrichard]

To clarify, I was more thinking that it's the documentation of PZ that should be updated with the design discussion you're talking about.

[yzhang-23]

To clarify, I was more thinking that it's the documentation of PZ that should be updated with the design discussion you're talking about.

Sure. I will add the design discussions to PZ doc.