Expand access to recruitment dashboard

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# TL;DR
Allow researchers to access the participant analytics / recruitment dashboard view.

# Narrative
As a researcher, I would like to be able to evaluate the success of my recruitment strategies over time.

# Acceptance Criteria
A precise description of how/when this issue will be considered closed, e.g.:

- [ ] Researchers with access to participant data can see that data in the analytics view
- [ ] Participant analytics permission is preserved for Lookit staff who should be able to see all data in analytics

# Implementation Notes
Note that the analytics view is currently rather resource-intensive; it may need to be streamlined to allow for many researchers using it instead of just occasional use by staff. Carefully review DB calls and server-side processing.

Start by locating the participant analytics view and the permission checks governing participant data, then review the database calls and server-side processing used by that view. Done means authorized researchers can see participant analytics while Lookit staff retain appropriate access, with the view usable for many researchers.

Written by the indexing model from the issue text.