#58 [Feature request] Channel search

## Background I post a lot of comments and I have to link to many videos to explain the context. In LBRY Desktop, sometimes I have to rely on channel search. It is sometimes the case that I remember only the channel but to get the URL of the video I want, I do a search on the channel with keywords. This is really handy because LBRY search isn't that good and channel search helps to narrow it down and get a better result. Despite being useful, channel search isn't there in FastLBRY-GTK. ## Summary - What: Channel search input box - Where: Channel page - When: Upon inputting string - How: Would list search results from the channel - Why: To find content easily (from memory/title/keyword), because LBRY search isn't good