Module plugin/validation

Enhances Roqueform fields with validation methods.

import { createField } from 'roqueform';
import validationPlugin from 'roqueform/plugin/validation';

const field = createField({ hello: 'world' }, [
  validationPlugin({
    validate(field) {
      if (field.key === 'hello') {
        field.isInvalid = field.value !== 'world';
      }
    }
  })
]);

field.setValue({ hello: 'universe' });

field.at('hello').validate();

field.at('hello').isInvalid // ⮕ true
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