Added hierarchy finder for saved replies

What does this MR do and why?

This allows for the GraphQL query to fetch all saved replies for the current group and all ancestor groups.

Query for root group:

SELECT "group_saved_replies".* FROM "group_saved_replies" WHERE "group_saved_replies"."group_id" IN (9970)

https://explain.depesz.com/s/tvm0

Query for when inside of a sub-group:

SELECT "group_saved_replies".* FROM "group_saved_replies" WHERE "group_saved_replies"."group_id" IN (9970, 1755573)

https://explain.depesz.com/s/xIYb

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