feat(Search): add support for features filter

[LuanRT]

Description

See #246.

Usage

import { Innertube, UniversalCache, YTNodes } from 'youtubei.js';

(async () => {
  const yt = await Innertube.create({ cache: new UniversalCache() });

  const search = await yt.search('Japan', { type: 'video', features: [ '4k', 'hdr', 'creative_commons' ] });
  console.log(search.videos.filterType(YTNodes.Video));
})();

Closes #246.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings