feat!: drop modules, general refactor and cleanup

runtime/queries/zig/folds.scm

@@ -0,0 +1,23 @@
+[
+  (block)
+  (switch_expression)
+  (initializer_list)
+  (asm_expression)
+  (multiline_string)
+  (if_statement)
+  (while_statement)
+  (for_statement)
+  (if_expression)
+  (else_clause)
+  (for_expression)
+  (while_expression)
+  (if_type_expression)
+  (function_signature)
+  (parameters)
+  (call_expression)
+  (struct_declaration)
+  (opaque_declaration)
+  (enum_declaration)
+  (union_declaration)
+  (error_set_declaration)
+] @fold