Add ability to view previously posted comments from channel

[jemsurfer]

Is your feature request related to a problem? Please describe.

• I wanted to view a comment I had previously posted, but I couldn't remember the name of the video. Describe the solution you'd like
• I would like to have a menu on my channel somewhere that allows easy viewing of previously posted comments (like Reddit) Describe alternatives you've considered
• Alternatively, there could be a way to sort through comments on a video to only show ones posted by a certain channel Additional context

[tzarebczan]

Thanks for opening the issue and sorry for not replying sooner! We have this filed under https://github.com/lbryio/lbry-desktop/issues/5146