Implement YouTube categories

**Is your feature request related to a usage problem (not a bug)? Please describe.**
Implement YouTube categories (see screenshots)

**Describe the solution you'd like to see implemented**
Categories return a normal json response that should be easy to parse and display like normal search results.
They seem to be generated from continuation tokens that have a bunch of data encoded into them.
1. Go to YouTube home page and categories will show
2. Open dev tools and click a category
3. YouTube makes a request to https://www.youtube.com/youtubei/v1/browse?key=xyz
4. The continuation token is stored in the request payload

**Describe alternatives you've considered**
.

**Screenshots**
Default categories: https://i.imgur.com/IyCDb88.png
After some searching: https://i.imgur.com/cuhOypL.png
Clicking on them returns results with the normal search ui: https://i.imgur.com/MVDBWTC.png

**Additional context**
Categories return different results than normal searches for the same category name.