Performance improvements

## Why? Using a high number of recursive `If` was slowing down the compilation. Profiling showed the bottleneck was `handleConflict`, a `O(N)` operation that happens everytime we add a new Node. ## The fix I switched the `resourceNodes` `Set` to a "custom" `Map` class, `ResourceNodesMap`. This automatically manages the Map keys by concatenating the packType and the path components. ## Performance improvements ### Before * Generating 1500 nested `if` took `33.430s` * Generating 100k sequential `if` took `17.02s` ### After * Generating 5000 nested `if` now takes `0.889s` (x37 🚀) * Generating 100k sequential `if` now takes `2.254s` (x7.5 🚀 ) More generally, the new O(1) complexity means Sandstone will better scale on large projects.