include a default keybinding for `apropos`

[dpsutton]

I was pairing with a colleague who uses Calva and we discovered that there doesn't seem to be a keybinding for apropos. I was hoping Calva could add a keybinding to make this more handy.

I'm a big fan of the "native" Clojure dev tools: dir, apropos, doc, source, pst, find-doc and have these keybindings at hand in inf-clojure. Highlighting these commands I think has two very beneficial consequences:

• first, of course, is that they are awesome in cider/calva/inf-clojure.
• Using tooling that is backed by these regular Clojure primitives means that they can be used from any Clojure repl: from a jar, dev environment, in production, whatever. Knowing that calva essentially calls (apropos foo) means you can do the same when helping a beginner who is not familiar with their tooling, or when you are repl'd into production which lacks nrepl. I'm a big fan of making these utilities more prevalent in the conversation.

[PEZ]

Thanks!

For anyone reading, wanting shortcuts for apropos et al, I'll note that it is pretty easy to create shortcuts for things like this using Custom REPL Commands.

I still agree that default shortcuts should be considered, for the reasons stated in the issue.