[BUG] Submit button does not work if a required field is hidden

[MurzNN]

Describe the bug
Submit button does not work if a required field is hidden.

To Reproduce
Steps to reproduce the behavior:

1. Create a form like this:

const contactSchema = defineSchema({
  fields: [
    {
      type: "text",
      name: "name",
      required: true,
      hidden: { $data: '/sendAsOrganization', eq: true },
    },
    {
      type: "text",
      name: "organization",
      required: true,
      hidden: { $data: '/sendAsOrganization', eq: false },
    },
    {
      type: "checkbox",
      name: "sendAsOrganization",
    },
  ],
});

2. Click on 'Submit'
3. See that the submit button become disabled forever, and no submit handler is called, no errors in console.

Expected behavior
We should somehow handle this case properly, or show an error, instead of silently hanging.

Screenshots

Environment (please complete the following information):

• OS: Linux
• Browser: Firefox
• `form-core` / `form-react` Version: 0.1.13

[MurzNN]

Replacing hidden to condition resolves the issue, but it'll be good to handle the hidden case somehow too, because, I afraid, not only me is stupid enough to just use hidden instead of reading the documentation 🙈

[MurzNN]

I think that a good solution will be introduce a global error area for the form, where we can put global validation errors, not related to a concrete field.

By the way, this area can be used to handling submission errors like "Bad gateway" because this is a global submission error, not related to a concrete field.