Paginate Instances Listing

The endpoint listing customer's project registered instances is not paginated and can be very slow to answer. (up to 7min for now...)

The current implementation is doing a SQL query, without any pagination mecanism.

In some limit cases; the number of instances can become really huge and the best approach would be to paginate the result. We could rely on a pageproivder to benefit ootb the pagination mecanism.

AC:

• The result page is paginated