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/binder.rs

@@ -276,6 +276,21 @@ impl Binder {
                 }
             }
 
+            UntypedKind::Pipe { inputs, lambda } => {
+                let mut bound_inputs = Vec::with_capacity(inputs.len());
+                for input in inputs {
+                    bound_inputs.push(self.bind(&input)?);
+                }
+                let bound_lambda = Box::new(self.bind(lambda.as_ref())?);
+                Ok(self.make_node(
+                    node.identity.clone(),
+                    BoundKind::Pipe {
+                        inputs: bound_inputs,
+                        lambda: bound_lambda,
+                    },
+                ))
+            }
+
             UntypedKind::Lambda { params, body } => {
                 let identity = node.identity.clone();
                 self.functions.push(FunctionCompiler::new(