It was initialy called "rename" which does not comply with
RESTful CRUD (create, update, read, delete) naming practice.
We remove the 'rename' operation in favour of template folder
resource update endpoint as it allows us to extend it with other
attributes.
new endpoints:
/services/<service_id>/move-to-folder
/services/<service_id>/move-to-folder/<target_template_folder_id>
* takes in a dict containing lists of `templates` and `folders` uuids.
* sets parent of templates and folders to the folder specified in the
URL. Or None, if there was no id specified.
* if any template or folder has a differen service id, then the whole
update fails
* if any folder is an ancestor of the target folder, then the whole
update fails (as that would cause a cyclical folder structure).
* the whole function is wrapped in a single `transactional` decorator,
so in case of error nothing will be saved.
* create template folder
* rename template folder
* get list of template folders for service (not nested/presented in any
particular way)
* delete template folder
Also removed `lazy=dynamic` from the `template_folder.templates`
relationship. lazy=dynamic returns a query object (which you can then
filter further). We just want to return the entire fetched list, at
least for now.
