@constraint Annotation for types/aliases

还没有人认领这个 Issue。

I was working with Annotations for documenting my code and wanted to add a warning if the user used a function that didn't fall under a specific pattern (`"0x%x%x%x%x%x%x%x%x"`) and tried finding a workaround. I'm not 100% fluent with .lua and don't have the confidence to PR, so take my idea instead.

My idea for the annotation would be as follows:
```lua
--- @constraint con_color (string.find(T , "^0x%x%x%x%x%x%x%x%x$") or string.find(T , "^%x%x%x%x%x%x$"))
--- @alias color string
--- @param col1 color
--- @param col2 color
local function set_col(col1, col2)
...
end
```

Obviously syntax could use work, but the basic idea would be to add a constraint, and have `T` or whatever variable name be the entry. This way you can give a warning to users about unsupported string or a number being too low/high being used. If there is already something like this please enlighten me as I couldn't find anything

首先检查 language server 现有的 @alias 和 @param 注解处理，因为 issue 没有指定具体的文件或测试。确定提议的 @constraint 语法如何验证别名并生成警告，然后在实现之前定义语法和预期行为；完成意味着已记录的约束对颜色示例有效，并且能够诊断无效值。

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