Add file/line support for defrecords and deftypes for both clj/cljs

Considering techniques to accomplish this.
1. Generate the factory-function name and grab meta off of its var.

Start by locating the definition-lookup handling for defrecords and deftypes in both Clojure and ClojureScript, then evaluate the issue's proposed factory-function and var-metadata approach. Done means definition results expose the correct file and line for both construct types in both languages; the issue names no tests or files, so add verification after finding the relevant entry point.

Written by the indexing model from the issue text.