feat(validation-errors): support flattening via flattenValidationErrors function

[TheEdoRan]

Sometimes it's better to deal with a flattened error object instead of a formatted one, for instance when you don't need to use nested objects in validation schemas.

This PR exports a function called flattenValidationErrors that does what it says. Be aware that it works just one level deep, as it discards nested schema errors. This is a known limitation of this approach, since it can't prevent key conflicts.

Suppose this is a returned formatted validationErrors object:

validationErrors = {
  _errors: ["Global error"],
  username: {
    _errors: ["Too short", "Username is invalid"],
  },
  email: {
    _errors: ["Email is invalid"],
  }
}

After passing it to flattenValidationErrors:

import { flattenValidationErrors } from "next-safe-action";

const flattenedErrors = flattenValidationErrors(validationErrors);

It becomes this:

flattenedErrors = {
  formErrors: ["Global error"],
  fieldErrors: {
    username: ["Too short", "Username is invalid"],
    email: ["Email is invalid"],
  }
}

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[github-actions]

🎉 This PR is included in version 7.0.0-next.19 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 7.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀