feat: exclude channels from search results, popular, trending, etc

[SethFalco]

While browsing Invidious/YouTube, sometimes the search results contains too much noise from channels I actively avoid. Namely low-quality content and content farms.

Think we could add a context-menu item, similar to how there is Add channel to feed?

This option would be named something like Hide channel, and will hide their content from search results, popular, and trending.