Add share button at various places (Like channel banner, playlists)

[MRDGH2821]

Use Cases

Just like there is a share button for individual videos, I would like to have share buttons at channel banner & playlists.

I'll mention other places where it is needed as and when I come to know.

If at all possible, one which doesn't feel like it would work is, sharing links to comment or just the comment text. Can be overengineered to share entire comment thread.

Proposal

The setting button or the 3 dot menu can show a share button which will allow us to share/copy link to channel/playlist.

References

#519 #794 #634

[Zvonimir-FUTO]

Duplicate of #519 and #634.