Better handling for `LogicStructure`s in `Pipeline`s

[mkorbel1]

Motivation

Currently, when you get a signal in a Pipeline, it just references that signal and that's it. But what about LogicStructures? If you access an element of a LogicStructure in additional to the LogicStructure itself, they are treated as separate signals. That's kind of confusing and unintuitive.

Desired solution

Make Pipeline more LogicStructure-aware, treating a get on an element of a LogicStructure the same as getting the LogicStructure then accessing its element.

Alternatives considered

No response

Additional details

No response

[mkorbel1]

Note that this is probably a breaking change to make since there may be existing designs depending on this behavior