* First pass at adding comment trees.
- Extracted comment replies into its own table.
- Added ltree column to comment
- Added parent_id param to GetComments to fetch a tree branch
- No paging / limiting yet
* Adding child_count to comment_aggregates.
* Adding parent comment update counts
* Fix unit tests.
* Comment tree paging mostly done.
* Fix clippy
* Fix drone tests wrong postgres version.
* Fix unit tests.
* Add back in delete in unit test.
* Add postgres upgrade script.
* Fixing some PR comments.
* Move update ltree into Comment::create
* Updating based on comments.
* Fix send soft fail.
