feat(curl): configuration setting to pass additional options to curl command for "Try it out" (#6288)

Allows `requestInterceptor` to add options to the curl command.
For example:

```js
requestInterceptor: function (request) {
  if (request.method === 'GET') {
    request.curlOptions = ['-g']
    request.url = request.url
      .replace('%5B', '[')
      .replace('%5D', ']')
      .replace('%2C', ',');
  }
  return request;
}
```

src/core/curlify.js

@@ -20,6 +20,11 @@ export default function curl( request ){
   let isMultipartFormDataRequest = false
   let headers = request.get("headers")
   curlified.push( "curl" )
+
+  if (request.get("curlOptions")) {
+    curlified.push(...request.get("curlOptions"))
+  }
+
   curlified.push( "-X", request.get("method") )
   curlified.push( `"${request.get("url")}"`)