Code Formatting: Whitespacing ValidateSet

Summary of the new feature

I've this validateset:

Sometimes I want it to have 2-3 per line so I start removing pressing delete button and I end up with what you see above. It would be nice if I could then press format and it would remove that unnessecary whitespace. While initially I thought it could be all automatic you said on twiter that it may quickly get out of control. I agree of course (even thou I would ant different styles to be available - like 3 validateset params per line) but at least maybe this can be addressed? It's just making sure there is only 1 white space per line (or defined value if it's needed).

首先在 PSScriptAnalyzer 中定位格式化器或格式化命令，并查看现有的空白规则或测试。明确目标是采用一种空白样式，还是让每行的项目数可配置，然后定义涵盖 ValidateSet 示例和预期格式化输出的测试。