[wip] Updating flytekit to handle dereferencing lists of promises (local)

[JackUrb]

Overview

The goal is to be able to do the kinds of things present in test_dataclass_elem_list_construction.py, namely be able to take the output of a promise, wrap it in a list or other collection, then pass the result elsewhere.

At the moment this breaks due to dataclass deserialization in flyte, as the derived promises don't have all the information required.

Implementation

Right now the implementation here only works for local, but gets to the core of the issue - promises need to be resolved before the TypeEngine.to_literal call on these goes through. When TypeEngine.to_literal gets called on a collection containing a dataclass value, it's not properly dereferenced.

This additionally is an issue when deserializing an int, as the fix for float -> int occurs in the dataclass transformer, which is not invoked when dereferencing, so the type is always resolved to float. For local, we can do a quick fix for this (adding the type information to the sub-nodes of the promise, then correcting if necessary.

Expanding to remote?

No idea where to get started on this, will reach out to Flyte folks.