Support `validator` in args definition

[peterroe]

Describe the feature

export default defineCommand({
  meta: {
    name: "Test",
    description: "A test command",
  },
  args: {
    len: {
      type: "string",
      description: "Limit len",
      validator(value) {
        return Number(value) > 24 & Number(value) < 999 ? true : "Len must more than 24 and less than 999 ";
      }
    },
  },
  run({ args }) {
  },
});

Additional information

• Would you be willing to help implement this feature?

[pi0]

Nice idea! Small neat pick i would call it validate.

Also PR more than welcome to implement this!

[kricsleo]

Perhaps align with the standard-schema? 🤔