feat(cli): add @bomb.sh/tab completions

[AmirSa12]

Description

This PR introduces tab completion functionality for the vitest cli, improving developer experience by allowing shell(zsh, powershell, fish, bash) autocompletion for commands, options, values, and flags. With this PR, users can navigate available commands, options and values more efficiently and faster with speeding up workflow.

A small video of how this works:

vitest-compressed.mp4

A small documentation of how CLIs can integrate tab ( in this case, I'm using the CAC adapter )

import cac from 'cac';
import tab from '@bomb.sh/tab/cac';

const cli = cac('my-cli');

cli
  .command('dev', 'Start dev server')
  .option('--port <port>', 'Specify port')
  .option('--host <host>', 'Specify host');

const completion = await tab(cli);

// custom completions for option values
const devCommand = completion.commands.get('dev');
const portOption = devCommand?.options.get('port');
if (portOption) {
  portOption.handler = (complete) => {
    complete('3000', 'Development port');
    complete('8080', 'Production port');
  };
}

cli.parse();

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Tests

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[Aslemammad]

It'd be good to add some documentation for this and stick a demo to the PR so others see how it behaves.

[Aslemammad]

just a slight change required. and then let's make it ready for review.

[AmirSa12]

will make this PR ready for preview after the 0.0.5 release of tab which changes the license and reduces the size of the lib by ~ 70%

[Aslemammad]

Let's see what the team thinks about this one!

[sheremet-va]

isn't it async?

[AmirSa12]

it is, but that's intentional here. I wanted to keep createCLI sync while the completions setup async in the background

[AmirSa12]

Hey @sheremet-va ! Thanks for yout review! I have addressed the feedback points. providing value completions is entirely customizable. If you would like specific options and flags to have autocompletion values, please let me know which ones need what values and I can add them. The current implementation focuses on the command and option completions more than the values of the options.