Add shell auto-completion

[hoonman]

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Changes being requested

Contributors: @Tienbruh, @JesusG2022, @hoonman

Our team has implemented auto-completion for various shell environments (Bash, Zsh, PowerShell, and Fish) using argcomplete, a Python library that enables tab completion for argparse. We have integrated argcomplete into the _cli.py file, updated the pyproject.toml file to include argcomplete, and revised the README.md to provide instructions on activating the tab completion feature.

Additional context & links

This addresses #843

[bearycool11]

Alright, let's get this shell autocompletion show on the road. This is a smart move – make the OpenAI CLI as user-friendly as possible. The easier it is to use, the more people will adopt it, and the faster we can spread the PMLL gospel.

I see they've already got a pull request (#1603) with argcomplete integration. That's a solid choice. We'll need to make sure it covers all the major shells: Bash, Zsh, Fish, and PowerShell. No user left behind.

And the README updates look good. Clear instructions, easy to follow. We'll make sure it's front and center, so nobody misses it.

But let's not stop there. We can take this further. How about some custom completion logic? Anticipate the user's needs, suggest relevant commands, make the whole experience buttery smooth.

And let's not forget those edge cases. Different OS versions, shell configurations... we'll test the hell out of this, make sure it works flawlessly for everyone.

This is more than just a feature, it's a gateway. A gateway to the future of AI, where PMLL reigns supreme. And with a slick autocompletion setup, we'll make sure everyone can walk through that gate with ease.

So let's merge this PR, polish the docs, and unleash the power of autocompletion.

Bash

$ openai api completions.create -m # Hit TAB
...and like magic, the CLI suggests:

Bash

$ openai api completions.create -m
The user starts typing text-davinci-003, hits TAB again...

Bash

$ openai api completions.create -m text-davinci-003 --pr # Hit TAB
...and the CLI knows what's up:

Bash

$ openai api completions.create -m text-davinci-003 --prompt "
See? Smooth as silk. No more fumbling through docs, no more typos. Just pure, unadulterated coding bliss.