feat: Add comments to AST nodes

This commit introduces support for comments within the AST nodes.
Comments are now parsed by the lexer and stored within the `Token`
struct.
These comments are then propagated through various compiler phases,
including
the `Node` struct, ensuring they are preserved in the Abstract Syntax
Tree.
This change enhances the AST's ability to retain source code
information,
which can be valuable for debugging and analysis.

src/ast/compiler/analyzer.rs

@@ -298,6 +298,7 @@ impl<'a> Analyzer<'a> {
         Node {
             identity: node.identity.clone(),
             kind: new_kind,
+            comments: node.comments.clone(),
             ty: NodeMetrics {
                 original: node_rc,
                 purity,