Add scheduling to articles API

[benhalpern]

Is this feature related to a problem? Please describe.

Advanced users of the platform, particularly our core team, like to pre-schedule posts and don't have a great way to do it via the API right now.

Describe the solution you’d like

Add necessary attributes to create and update functionality to articles API which will allow users to schedule posts without the "markdown frontmatter" approach.

Definition of Done

• Create and update accepts attributes for scheduling.

[github-actions]

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[sugan0tech]

@benhalpern With the existing call-in web, I can see the fields for scheduling as in future dates. No other specific call for scheduling.

{
  "publishedAtTime": "09:19",
  "publishedAtDate": "2023-10-18",
}

So what you are suggesting is having dedicated fields for schedules right?