CDB3-3239 Announcement. Add endpoint for documents and history

https://procedure-dev.prozorro.sale/api/jobber/announcements/632965ccd12d127ebfe3ce02 - announcement OK
https://procedure-dev.prozorro.sale/api/jobber/announcements/632965ccd12d127ebfe3ce02/documents - 404
https://procedure-dev.prozorro.sale/api/jobber/announcements/632965ccd12d127ebfe3ce02/documents/history - 404