feat!: drop modules, general refactor and cleanup

runtime/queries/solidity/folds.scm

@@ -0,0 +1,20 @@
+[
+  (error_declaration)
+  (contract_body)
+  (struct_declaration)
+  (enum_declaration)
+  (event_definition)
+  (assembly_statement)
+  (block_statement)
+  (if_statement)
+  (for_statement)
+  (while_statement)
+  (yul_block)
+  (function_body)
+  (call_expression)
+  (inline_array_expression)
+  (tuple_expression)
+  (struct_expression)
+  (comment)
+  (emit_statement)
+] @fold