[cdk:forms] 内置校验函数没有提供默认提示信息

[lvzero535]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

const { required, minLength, maxLength } = Validators 引用这些API时，当不在IxFormItem上写message时没有默认的提示信息

What does the proposed API look like?

使用内部的校验函数时不通过校验且不在IxFormItem上写message时有默认的错误提示信息

[idux-bot]

Translation of this issue:

[CDK: FORMS] Built-in model function does not provide default prompt information

• i Have Searched The [https://github.com/iduxfe/idux/issues) of this repository and believe That this is not a duplicate.

What proBLEES THIS Feature SOLVE?

const {required, minlength, maxlength} = validators references these APIs, there is no default prompt when writing Message on IxFormItem

What does The proposed API Look Like?

With the inside check function, you do not pass the check and write Message on the IxFormItem, there is a default error message.