Publishing premiers

[bedeho]

Background

A user made a request for this, and it also unlocks the possibility of scheduled NFT drops when combined with a deeper runtime change here Joystream/joystream#4557. This publishing may also reflect control publisher has around video features like reactions and comments Joystream/joystream#4558. Finally, in order to enforce lack of distribution of content aligned with this date, we will need to get access policy metadata implemented Joystream/joystream#4332.

Dependencies

• Delayed video publishing joystream#4557
• Delayed video publishing metaprotocol accomodation joystream#4558
• Standardise Argus access policy signals in metadata joystream#4332

Proposal

Allow video creators to publish video premiers, which work roughly as follows

• As a creator I would like to publish a video which only can be consumed, possibly commented & reacted on or have it's NFT features function, at some pre-specified time in the future.
• As a creator I would like to be able to update the release date of such a video if it has not already transpired, and provide some note or explanation around the delay.
• As a consumer I would like to view what videos are going to premier on a given channel.
• As a consumer I would like to see premier information on a video, both before and after it has premiered.
• As a consumer I would like to easily distinguish videos up for premier from those which are live across the application.

Now notice that we could actually implement almost all of this while Joystream/joystream#4332 is not done, and simply not be so bothered because Atlas itself would prevent playback, even though the infrastructure fundamentally did not. Just making a note of that for the benefit of release flexibility.

I'm not sure how this feature should work for playlists.