Please improve getBasicInfo's performance and ytdl's overall performance

### Before creating an issue, please try the following

- Are you on the latest version of ytdl-core?
Yes

I've noticed that getInfo uses ~850ms on average, and getBasicInfo uses ~500ms, the code i've used to test this is:

```js
const ytdl = require('ytdl-core');
const start = Date.now();
ytdl.getInfo('https://www.youtube.com/watch?v=HhjHYkPQ8F0').then(data => {
return Date.now() - start;
})
```
and
```js
const ytdl = require('ytdl-core');
const start = Date.now();
ytdl.getBasicInfo('https://www.youtube.com/watch?v=HhjHYkPQ8F0').then(data => {
return Date.now() - start;
})
```

I believe and hope that the performance of ytdl's getBasicInfo could get further optimized, or add some array-like options to choose what kind of information i want to extract, and not get the entire gigantic object which is quite slow