Description:

This PR introduces Cloud Functions to handle the publishing and unpublishing of documents in the tanam-documents collection. The implementation ensures that documents are copied to a public collection (tanam-public) when published and removed from the public collection when unpublished. It also manages the copying and deletion of associated files in Cloud Storage.

Closes #382

Changes Introduced:

1. Cloud Function: onPublishChange

   • Triggers on document write events in the tanam-documents/{documentId} collection.
   • Enqueues tasks to publish or unpublish the document based on the change in document status.

2. Task Function: taskPublishDocument

   • Handles the publishing of documents by copying the document data to the tanam-public collection.
   • Copies associated files from the Cloud Storage path /tanam-documents/{id}/** to /tanam-public/{id}/**.

3. Task Function: taskUnpublishDocument

   • Handles the unpublishing of documents by deleting the document data from the tanam-public collection.
   • Deletes associated files from the Cloud Storage path /tanam-public/{id}/**.