An annotation for indicating that a function may error

還沒有人認領這個 Issue。

It would be pretty useful to have an indicator of whether the function may error (and thus needs to be handled with `pcall` or the like).
```lua
---@fallible
---@param bar string
---@return string bar
local function assert_is_foobar(bar)
if bar ~= "foobar" then
error("bar isn't equal to foobar")
end
return bar
end
```
I'm aware of #1881 but it doesn't fullfill the same purpose as `@fallible`, the main difference being the fact that `@noreturn` indicates that the function never returns while this indicates that the function could return an error

The LSP server could also potentially show the user a warning if they don't wrap a `@fallible` function in a `pcall` call

首先檢視語言伺服器目前如何處理相關的 @noreturn 註解，以及如何分析 pcall 的使用情況。該 issue 沒有指定檔案或測試，而且預期的警告行為被描述為可選，因此在開始撰寫程式碼之前，需要釐清實作範圍和完成標準。

由索引模型根據 Issue 內容生成。