Implement refreshing of channel pages

[dankxylese]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

Describe the feature you want

Would it be possible to allow you to refresh the channel page?

I use an RSS feeder for my subs, and noticed there was a new video on a channel I just watched. I clicked on the channel profile under the video I just watched, but because I've loaded the page before I was not able to see the new video in the list. Clicking back to close the channel page and navigating to it under the video again, did not refresh the page. I had to kill the app to force it request the page again.

How will you/everyone benefit from this feature?

It probably wouldn't effect many people, but the ones it will, will have an improved UX. It should also be easy to implement.

You can regard it as a low priority issue.

Edit: I am on the latest 0.21.6