feat(db): locator columns for tombstoned annotations

GetTombstonedAnnotationsForBook now also returns each tombstone's
start_position/end_position and epubcfi_start/end (note: position/
epubcfi_location, bookmark: position/cfi_position), so serving code
can resolve a device-native locator for deletions of web-created
annotations, whose device_sync_data carries no pos0.

internal/database/queries/queries.sql

@@ -992,7 +992,11 @@ SELECT
     mh.dedup_key,
     'highlight' as annotation_type,
     mh.device_sync_data,
-    mh.deleted_at
+    mh.deleted_at,
+    mh.start_position,
+    mh.end_position,
+    mh.epubcfi_start,
+    mh.epubcfi_end
 FROM media_highlights mh
 WHERE mh.media_item_id = $1 AND mh.user_id = $2 AND mh.deleted = TRUE AND mh.deleted_at > $3
 UNION ALL
@@ -1001,7 +1005,11 @@ SELECT
     mn.dedup_key,
     'note' as annotation_type,
     mn.device_sync_data,
-    mn.deleted_at
+    mn.deleted_at,
+    mn.position as start_position,
+    NULL as end_position,
+    mn.epubcfi_location as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_notes mn
 WHERE mn.media_item_id = $1 AND mn.user_id = $2 AND mn.deleted = TRUE AND mn.deleted_at > $3
 UNION ALL
@@ -1010,7 +1018,11 @@ SELECT
     mb.dedup_key,
     'bookmark' as annotation_type,
     mb.device_sync_data,
-    mb.deleted_at
+    mb.deleted_at,
+    mb.position as start_position,
+    NULL as end_position,
+    mb.cfi_position as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_bookmarks mb
 WHERE mb.media_item_id = $1 AND mb.user_id = $2 AND mb.deleted = TRUE AND mb.deleted_at > $3
 ORDER BY deleted_at DESC;