List the firms the caller can send repo requests to, by rfq_id and business name.
Repo is bilateral: Temple enables each counterparty for the caller once the two firms
have onboarded with each other. Address a repo request to some of them with their
id values as user_ids on POST /api/rfq/requests, or omit user_ids to send it
to all of them.

This is the only RFQ endpoint that returns business names. A counterparty is listed
only while it can receive repo requests: RFQ and the repo board enabled, the account
unlocked, and able to trade with the caller (Omnibus accounts only with Omnibus
accounts).