feature: basic split ssr filtering

This basic behaviour allow splitting of /xyz/ and one /xyz/ with filtering.

EP can now call /ssr/actors/ and /ssr/actors/?search-fields=visible&search-terms=True&search-method=exact and have a server cache for both. Needed to display projects from non-visible actors, thus removing almost 50 requests from production.

assigned to @balessan

changed the description

@balessan I manually deployed this branch to ep-contributions and energie-partagee for immediate performance improvement. It works well. Let me know if you'd like me to handle the re-deployment after it's merged.

merged

mentioned in commit ee3ce1da