Implement translation from Monomorhpized AST to SSA IR

[kevaundray]

Problem

This is known as ssa_gen in our current codebase, and convert the monomorphized AST into the IR defined in the SSA module.

This is a tracking issue and should be broken into multiple smaller tasks. One way to break this down is by instructions.

We ideally don't want to be doing any optimizations on the fly here, to make this pass very simple. This is the strategy that most compilers go with; a naive approach to convert it to SSA then apply optimizations.

Proposed solution

Implement this as a separate module in ssa_refactor

Alternatives considered

No response

Additional context

No response

Submission Checklist

• Once I hit submit, I will assign this issue to the Project Board with the appropriate tags.