feat: command aliases

[thereis]

Hey, firstly, thank you for the incredible project! In few prompts I could refactor one my internal CLI to be fully typed and that to supports agents.

One feature that I'm missing is command full aliases, for example:

Cli.create('greet', {
  description: 'A greeting CLI',
  fullAliases: ['cumprimentar', 'saludar', 'begroeten'],
  args: z.object({
    name: z.string().describe('Name to greet'),
  }),
  run(c) {
    return { message: `hello ${c.args.name}` }
  },
}).serve()

This would help the CLI to scale for localization 😄