Re-enable using sharing for experiment statistics

Currently only admin users can use the getExperimentStatistics method and this returns results for the entire gateway. This issue is to enable non-admin users to call getExperimentStatistics. One use case would be for course instructors that are using Airavata and sharing resources (via GRP) with a class of students to monitor the experiments of those students.

Most of this work was done in AIRAVATA-2990 but it has since been commented out (see AIRAVATA-3158) because the sharing service applies a limit of 1000 to queries there and the experiment statistics can easily exceed 1000 experiments. So the main problem to solve in this issue is how to efficiently apply a filter for a large number of shared experiments to the experiment statistics queries.