refactor: add emitter for code generation

src/template/itemplate.ts

@@ -1,7 +1,8 @@
 import Context from '../context/context'
 import Token from '../parser/token'
+import { Emitter } from '../render/emitter'
 
 export default interface ITemplate {
   token: Token;
-  render(ctx: Context): Promise<string>;
+  render(ctx: Context, emitter: Emitter): Promise<string>;
 }