Purescript client

[ngua]

Ogmios currently comes with a TypeScript client that communicates with the server via websockets. We might want to create a similar client in Purescript, which at a minimum should manage the websocket connection and drive the mini-protocols

[Benjmhart]

update: we have the initial wiring for cardano-browser-tx in raw websockets, if generating a client is difficult OR if the client doesn't use Aff monad, i'd say this isn't worthwhile

the types can be reasonably understood by examining the typescript client source, and the websocket protocol is reasonable to navigate.