enable cli autocompletion

[zzstoatzz]

not sure why we had this turned off

when on, allows

» prefect --install-completion

which gives

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[chrisguidry]

If I recall, it was because we weren't happy with the import times (and still aren't). In my opinion, that should make us want to speed up imports, not disable completions! Thanks for turning this back on

[serinamarie]

I think the changes being made to speed up the CLI mean that this can be merged.
Since Andrew and I needed to add the following lines to our .zshrc to enable this, I wonder if there is any easy way to mention this in the help message. Certainly not blocking, though.

autoload -Uz compinit
zstyle ':completion:*' menu select
fpath+=~/.zfunc
compinit