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/dumper.rs

@@ -203,6 +203,15 @@ impl Dumper {
                 self.visit(args);
                 self.indent -= 1;
             }
+            BoundKind::Pipe { inputs, lambda } => {
+                self.log("Pipe", node);
+                self.indent += 1;
+                for input in inputs {
+                    self.visit(input);
+                }
+                self.visit(lambda);
+                self.indent -= 1;
+            }
 
             BoundKind::Block { exprs } => {
                 self.log("Block", node);