String should be sanitized on hover

還沒有人認領這個 Issue。

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Linux

### What is the issue affecting?

Hover

### Expected Behaviour

Consider the following code:

```lua
s = "one\ntwo\nthree"
```

When hovering over it, I'd expect to see the newline characters just as I wrote them in.

### Actual Behaviour

Instead, the newlines and tabs would get "expanded", breaking the way the hover looks.

### Reproduction steps

1. Create a string variable with newline (\n) or tab characters (\t)
2. hover over the variable

### Additional Notes

_No response_

### Log File

_No response_

透過建立包含換行字元或定位字元的 Lua 字串，並在 Visual Studio Code 擴充功能中將游標移到變數上來重現問題。從 language server 的 hover 處理開始，追蹤字串的格式化方式；當 hover 保留預期的跳脫字元且不破壞其版面配置時，即表示完成。

由索引模型根據 Issue 內容生成。