Add ocp-indent as a formatter (#306)

ocp-indent allows indenting even partially compiling OCaml code, while
ocamlformat requires the code to compile correctly. Also, Doom Emacs
uses ocp-indent when ocamlformat's configuration file is not found, and
not having an ocp-indent formatter gives an error.

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Co-authored-by: Radon Rosborough <radon@intuitiveexplanations.com>

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