Implement AST to Core Translation

[iamrecursion]

Summary

The next step in the compiler development epic is to translate from the parser's AST to the new Core language. This translation is one part of connecting the new core language into the working interpreter.

Value

We have introduced Core into the mix while still having a working interpreter, allowing us to start to move the existing ad-hoc analysis into well-principled passes on the new core language.

Specification

• Using the existing machinery from luna-package fails to compile on Windows #276, translate the parser AST to the new Core type.
• This translation should be done at a high level, and will use nodes that are both primitive and ones that represent syntactic sugar.
• No semantic information should be lost in this translation.

Acceptance Criteria & Test Cases

• The parser's AST can be translated into core.
• No tests are necessary for this process as it will go away soon.