Add ClojureSublimedEval command wrap_fstr optional arg

This satisfies the #101 requirements. The implementation adds optional argument `wrap_fstr` to the `ClojureSublimedEval` command. `wrap_fstr` should be a format string for the `%` operator Example usage: ``` {"keys": ["ctrl+shift+enter"], "command": "clojure_sublimed_eval", "args": {"wrap_fstr": "(doto %s clojure.pprint/pprint)"} "context": [{"key": "selector", "operator": "equal", "operand": "source.clojure"}]} ``` I have tested this update with the socket repl connection and the raw nREPL. All other ones should reuse the same logic as the raw nREPL. The original behavior of the `ClojureSublimedEval` is left as is by default, the update is backwards compatible