该方法从v2.5.0版本开始提供，用于同时查询数据记录列表及总数量，一般用于分页查询场景中，简化分页查询逻辑。
方法定义：该方法用于同时查询数据记录列表及总数量，一般用于分页查询场景中。方法定义如下：
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// AllAndCount retrieves all records and the total count of records from the model.
// If useFieldForCount is true, it will use the fields specified in the model for counting;
// otherwise, it will use a constant value of 1 for counting.
// It returns the result as a slice of records, the total count of records, and an error if any.
// The where parameter is an optional list of conditions to use when retrieving records.
//
// Example:
//
// var model Model
// var result Result
// var count int
// where := []interface{}{"name = ?", "John"}
// result, count, err := model.AllAndCount(true)
// if err != nil {
// // Handle error.
// }
// fmt.Println(result, count)
func (m *Model) AllAndCount(useFieldForCount bool) (result Result, totalCount int, err error) |
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