feat: Add typed lambda registry to Optimizer

The Optimizer now accepts a typed lambda registry, allowing it to
perform more aggressive inlining and beta-reduction on globally defined
functions. This is a significant step towards optimizing recursive and
globally defined lambdas more effectively.

src/ast/compiler/snapshots/myc__ast__compiler__optimizer__tests__opt_assignment_safety.snap

@@ -1,6 +1,6 @@
 ---
 source: src/ast/compiler/optimizer.rs
-assertion_line: 720
+assertion_line: 844
 expression: dump
 ---
 Lambda (Upvalues: 0) <Metadata: Metadata { ty: Function(Signature { params: Tuple([]), ret: Int }), is_tail: true }>
@@ -11,4 +11,4 @@ Lambda (Upvalues: 0) <Metadata: Metadata { ty: Function(Signature { params: Tupl
       Constant: 10 <Metadata: Metadata { ty: Int, is_tail: false }>
     Set: Local(0) <Metadata: Metadata { ty: Int, is_tail: false }>
       Constant: 20 <Metadata: Metadata { ty: Int, is_tail: false }>
-    Constant: 20 <Metadata: Metadata { ty: Int, is_tail: true }>
+    Get: x (Local(0)) <Metadata: Metadata { ty: Int, is_tail: true }>