[feature]: Add synctest to our loadtest suite

[GeorgeTsagk]

Description

We currently have loadtests for minting and sending assets. One other aspect of tapd we want to loadtest is the universe. The purpose of a synctest is to fetch data from a universe server based on certain configurations.

To keep the topology simple, we won't have on-demand tapd nodes performing the client requests to the universe, instead we'll use lite golang client code that performs the RPC requests directly. We don't really care about handling the responses, we just want to make sure we perform them. The purpose is to emulate a full-sync by multiple clients.

The configuration could include things like whether we're doing a full sync or not, number of clients, or number of syncs per client.