This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
Added order and direction parameters for sorting admin user pages. This
commit only includes backend api changes.
https://meta.discourse.org/t/make-admin-users-list-sortable-suggestion/47649
Now you can pass in `order` and `asc` parameters to the
`/admin/users/list/<query>.json` endpoint.
Example:
`/admin/users/list/active.json?&order=post_count` which defaults to desc
and
`/admin/users/list/active.json?order=post_count&asc=true`
