Add max_rune_size and min_rune_size annotations to validate Chinese strings.

[wangliyue2009]

Add max_rune_size and min_rune_size annotations to support length validation of Chinese strings.

thrift

struct Example {
1: string MaxRuneString (vt.max_rune_size = "10")
2: string MinRuneString (vt.min_rune_size = "10")
3: map<string, string> KeyValues2 (vt.key.max_rune_size = "10" vt.key.min_rune_size = "10")
}

*_validator.go

func (p *Example) IsValid() error {
	if len([]rune(p.MaxRuneString)) > int(10) {
		return fmt.Errorf("field MaxRuneString max_rune_size rule failed, current value: %d", len([]rune(p.MaxRuneString)))
	}
	if len([]rune(p.MinRuneString)) < int(10) {
		return fmt.Errorf("field MinRuneString min_rune_size rule failed, current value: %d", len([]rune(p.MinRuneString)))
	}
	for k := range p.KeyValues {
		if len([]rune(k)) > int(10) {
			return fmt.Errorf("field k max_rune_size rule failed, current value: %d", len([]rune(k)))
		}
		if len([]rune(k)) < int(10) {
			return fmt.Errorf("field k min_rune_size rule failed, current value: %d", len([]rune(k)))
		}
	}
	return nil
}

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