Add more source-to-REPL support

[bpringe]

I've been using this extension for a while now, and VSCode is the only editor I've used for Clojure (fairly new to Clojure). I was reading on clojure.org about enhancing my REPL workflow, as well as looking at other editors to see if I was missing something that could improve my workflow. I found no significant reason to change editors, but I did notice clojure.org has a section about what to expect from an in-editor REPL integration. It seems this extension only implements one of the six features they mention. Forgive me if I'm missing something.

I know this extension can load the current file in the REPL, but here are some other things that it either doesn't implement or I'm unaware of:

• Send form before caret to REPL
• Send top-level form to REPL
• Switch the REPL's namespace to current file
• Show evaluation inline
• Replace expression with its evaluation

For a description of each, see this section from clojure.org. If I am correct, are there any plans to implement these features? Thank you.