Add option to auto-refer repl-utilities

[PEZ]

I've added an option to have REPL utilities (clojure.main/repl-requires) auto-referred on connect of the REPL. So that things like (doc <something>) works. This works when starting a clj REPL on the command line, Leiningen does it, and so does CIDER.

I made it enabled by default to happen on-connect, and there are options such that the user can opt out entirely, and also to opt in for it happening in all namespaces.

• Fixes Auto-refer repl-requires as part of connecting #2154

My Calva PR Checklist

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Ping @PEZ, @bpringe, @corasaurus-hex, @Cyrik