Optionally use Innertube (Youtube Internal) API instead of Invidious

[Kladki]

Recently, Youtube has been aggressively blocking third party clients like Invidious, meaning that there are now very few public working Invidious instances, and they are not greatly reliable. However, if youtube-tui uses the Youtube API directly rather through invidious, it is much less likely to get blocked, as far fewer requests are coming from a single IP address (range).

Crates like rustypipe for using this API already exist, so you don't have to make the library from scratch.