Task/581 v1 context entities attributes 4ops

### Description
Four new conv ops:
GET/PUT/POST/DELETE /v1/contextEntities/type/TYPE/id/ID/attributes/ATTR_NAME

For the harness tests to work, the type must be empty.
If there is a type the harness test doesn't work.
The choice was to either remove the harness test, leave it erroneous or change so that the type is empty.
This 'bug' must be fixed but perhaps not in this PR.