feat(list): add filterPredicate property to handle custom filtering

[driskull]

Related Issue: #6544

Summary

• add filterPredicate property.
  • filterPredicate: (item: ListItem["el"]) => boolean;
• add e2e test
• cleanup

Example

list.filterPredicate = (item) => {
  if (list.filterText === "all") {
    return true;
  }

  return item.value === "item2";
};