perf: improve performance by 4x by simplified parseFile

- previously deprecated `getTemplate()` and `getTemplateSync()` not no longer supported
- `opts` no longer support dynamic set in `parseFile()`, `renderFile()` arguments

benchmark/engines/liquid.js

@@ -4,6 +4,7 @@ const { join } = require('path')
 
 const liquid = new Liquid({
   root: join(__dirname, '../templates'),
+  cache: true,
   extname: '.liquid'
 })