Categorize bigint field as a number field

Good idea, I'll work on this.

As per CR of https://www.drupal.org/node/3375748 → this required Drupal sites to be 10.2. So pushed the minimal version of Drupal to 10.2

please merge it, it's very urgent on drupal 11, it blocks all fields
new attributes PHP 8.0

#[FieldType(
  id: "bigint",
  label: new TranslatableMarkup("Number (bigint)"),
  description: [
    new TranslatableMarkup("This field stores a big integer number in the database."),
  ],
  category: "number",
  weight: -10,
  default_widget: "bigint",
  default_formatter: "bigint_item_default"
)]

Hi I can merge if someone just reviews it. You can add your changes to the MR and I'll review it.