EntityProxyDataStream - Fix empty array on main thread access

[mbaker3]

@jkeon Feel free to tag this for further improvement or future fixing in an issue. This was a naive attempt at fixing the issue.

What is the current behaviour?

Using the deferred array in a synchronous context always results in a 0 length array.

What is the new behaviour?

EntityProxyDataStream now correctly detects when the read dependency is complete and constructs a normal NativeArray<T> and passes that into the DataStreamActiveReader.

What issues does this resolve?

• None

What PRs does this depend on?

• None

Does this introduce a breaking change?

• [ ] Yes
• [x] No

[mbaker3]

Comments addressed. Ready for re-review