Download button in player notification

[ghost]

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.

What feature do you want?

The title already explains it.

Adding a small download button next to other notification actions.

Why do you want this feature?

Not any big issue.

Just a small feature that (I think) could be easy to add, and would be very nice.

[XiangRongLin]

@mhmdanas I don't find think the issue, as is, is good for first timers

1. There is some ambiguity on whether to add a sixth button to the notifications or whether to make the download button an option for one of the existing 5
2. many codeplaces need to be touched: the settings, the notification handler where one has to also figure out how to start the download

[triallax]

@XiangRongLin that's fair, my assessment was mistaken.