Feat: Add Pipe Node

Introduces a new `Pipe` node to the Abstract Syntax Tree (AST).
This node represents a functional composition pattern, allowing
for chaining of operations.

The changes include:
- Defining the `Pipe` variant in `BoundKind` and `UntypedKind`.
- Implementing parsing logic for the `pipe` keyword.
- Adding handling for the `Pipe` node in various compiler passes
  (analyzer, binder, captures, dumper, macros, optimizer, TCO,
  type checker).
- Including a placeholder implementation for `Pipe` execution in the
  VM.
- Updating integration tests to use the new `pipe` syntax.

src/ast/compiler/optimizer/utils.rs

@@ -152,6 +152,12 @@ impl UsageInfo {
             BoundKind::Again { args } => {
                 self.collect(args);
             }
+            BoundKind::Pipe { inputs, lambda } => {
+                for input in inputs {
+                    self.collect(input);
+                }
+                self.collect(lambda);
+            }
             BoundKind::Nop | BoundKind::FieldAccessor(_) | BoundKind::Extension(_) => {}
         }
     }