Add julia-repl-send-{paragraph,function}

[justbur]

Bind C-c C-f to julia-repl-send-function.

I didn't add a binding for the paragraph function, because the logical choice (C-c C-p) was taken.

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[tpapp]

Thanks for this PR. In the past (beginning-of-defun) etc didn't work well with julia-emacs, because of issues like

JuliaEditorSupport/julia-emacs#76

which is why I didn't include it. How is it working out for you in practice? Also the paragraph version.