Clojurians Log v2

Afternoon folks - another release for you 🚀 The Clojure API (`xtdb.api`) is now implemented in terms of the Postgres wire server rather than being a separate code path - essentially a thin wrapper using Sean's next.jdbc. We didn't want your code to use different paths in dev and prod, depending on whether the node was in-process or remote, so this change ensures XTDB behaves the same in both cases. With this (as previously mentioned) we've removed the Clojure HTTP client in order to focus on the consistency of the Postgres wire server - you should Just™ be able to use xtdb.api/client rather xtdb.client/open-client, or you can still hit the HTTP server directly using clj-http/curl/equivalent. Also the first iteration of Postgres's COPY - we've seen this give a good ~3x over the equivalent INSERTs if you're able to insert in batch. Enjoy! 🙂