Add support for date validation rule

[YournameITManoah]

Regression of #79

I have a Form Request with a date attribute with the date rule. It should be parsed as a string<date>, but it's parsed as a regular string.

The Form Request:

class StoreTimeLogRequest extends FormRequest
{
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, ValidationRule|array|string>
     */
    public function rules(): array
    {
        $current = $this->route('time_log');
        return [
            'project_id' => ['required', 'integer', Rule::exists('user_tasks')->where(function (Builder $query) {
                return $query->where('user_id', \Auth::id());
            })],
            'task_id' => ['required', 'integer', new ValidUserTask()],
            'date' => 'required', 'date', 'after_or_equal:1 year ago', 'before_or_equal:now'],
            'start_time' => ['required', new Time(), new UniqueTimeLogFrame($current)],
            'stop_time' => ['required', new Time(), 'after:start_time', new UniqueTimeLogFrame($current)],
        ];
    }
}

The output: