Reorganize Code Base

[drew-y]

Cleaned up directory structure and simplified interfaces.

There is now a single clear compile fn (and a compileSrc fn for src directories) exposed by index.

Additionally, the compiler has been combined into three top level phases, each which their own simple interface as well.

• Parsing
• Semantics
• Assembly

Also migrated to the standard ESM package structure. So we can use the normal .ts extension.

[drew-y]

The failing test is EXTREMELY bizarre. It does not fail on my machine. I've run the action locally using act to simulate the runner and it still passes. The "diff" of the failing test is also not different. There are NO differences.