Extending alias functionality [Suggestion]

Good day, my suggestion is quite unusual - I'm requesting an additional functionality for aliases, basically adding ability to define regexp for string-based aliases. For example I have something like this:

---@alias Identifier string

That makes type check that Identifier is a string, but don't check if identifier need a custom structure, for example if correct structure is something like namespace:path it can't be validated with LLS.

If on another hand I can able to add a regexp to it:

---@alias Identifier string("^[^:]*:[^:]*$")

Then it will automatically check if identifier is valid

首先檢視現有的別名型別檢查行為，以及 LuaLS 如何表示以字串為基礎的型別。需要在實作之前定義所要求的語法與正規表示式語意。完成內容應包括根據指定模式驗證受正規表示式約束的別名，例如 Identifier。