Also emit TokenKind in debug

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/cases/2-ast@multiple.snap

@@ -6,23 +6,23 @@ input_file: tests/cases/multiple.nomo
 TemplateAst {
     root: [
         StaticContent(
-            "Hi there! My name is" (0..20),
+            [Content]"Hi there! My name is" (0..20),
         ),
         Interpolation {
             prev_whitespace_content: Some(
-                " " (20..21),
+                [Whitespace]" " (20..21),
             ),
             expression: VariableAccess(
-                "name" (25..29),
+                [Ident]"name" (25..29),
             ),
             post_whitespace_content: Some(
-                " " (32..33),
+                [Whitespace]" " (32..33),
             ),
         },
         Interpolation {
             prev_whitespace_content: None,
             expression: VariableAccess(
-                "lastname" (37..45),
+                [Ident]"lastname" (37..45),
             ),
             post_whitespace_content: None,
         },