[FEATURE REQUEST] Invoke code formatting from CLI

還沒有人認領這個 Issue。

I have a project with 3K+ Lua files I need to format. The problem is if I use something like [this](https://marketplace.visualstudio.com/items?itemName=jbockle.jbockle-format-files) it takes forever. I disabled diagnostics like this:
```json
"Lua.diagnostics.enable": false,
"Lua.diagnostics.workspaceDelay": 10000,
"Lua.diagnostics.workspaceRate": 1,
"Lua.diagnostics.disableScheme": ["git", "."]
```
Yet for some reason `lua-language-server` triggers diagnostics all the time and it slows down the process.

So, it would be great to trigger code formatting from CLI without doing any diagnostics.

I tried [this tool](https://github.com/Koihik/LuaFormatter) but it has different styling by default so it was not really helpful, but it's blazing fast.

首先追蹤 language server 既有的格式化入口與 CLI 引數處理；此 issue 未指定特定的檔案或測試。完成標準是：可以透過 CLI 為大型 Lua 專案呼叫格式化，不會觸發診斷，並保留 language server 的樣式。

由索引模型根據 Issue 內容生成。