feat: Better support for SourceStatus

[commonpike]

No description provided.

[commonpike]

Still todo

• only prepare posts from incoming
  • when preparing a source, give it a unique id
  • Post id should not be in json - it is derived from source
  • dont change the status on Post.prepare - change it higher
• only scheduleNextPost/s from pending and active
  • update getLastPost and getNextPostDate
• only publishDue from active
  • update getDuePost
• add janitor/archive api call to
  • move posts to archive
  • update source statusses to match post statusses
• by default, limit get-posts and get-sources to not archived

Test

• prepare-posts / prepare-post
• schedule-post / schedule-next-post
• publish-post / publish-due-posts

[commonpike]

redone in #145, closing