feat(clap_complete): add completion subcommand

Add clap_complete feature to duniter.

It takes the form of a new subcommand namely completion as follow:

USAGE:
    duniter completion --generator <GENERATOR>

OPTIONS:
    -g, --generator <GENERATOR>    [possible values: bash, elvish, fish, powershell, zsh]
    -h, --help                     Print help information
    -V, --version                  Print version information

This merge request is related to #37 (closed).

requested review from @librelois

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approved this merge request

resolved all threads

requested review from @tuxmain and removed review request for @librelois

@PacoVelobs looks good to me, thanks for your contribution

cc @tuxmain for a second review

Maybe indicate how to use this? The command just outputs a (very) long script I don't know what to do with.

@PacoVelobs I agree with @tuxmain , can you add a basic usage example please?

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I added some more usage information.

Unfortunately, I only ever used bash so I can only talk about what I know. I remember reading about zsh and its compinit built-in function but I'd rather not write some false information about it.

The shell lines of the documentation have been tested.

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enabled an automatic merge when the pipeline for 5b89ed8f succeeds

Thanks you @PacoVelobs, I'll rebase and merge

canceled the automatic merge

resolved all threads

merged