lua-language-server not detecting types when destructuring Tuple types with ~table.unpack~

还没有人认领这个 Issue。

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

Other

### Which OS are you using?

Windows

### What is the issue affecting?

Diagnostics/Syntax Checking

### Expected Behaviour

I might be wrong here, but I assume this should work?
Language server should detect the types from the defined tuple:

```lua
---@alias my_tuple { [1]: integer, [2]: boolean }

---@type my_tuple
local tuple = {1, true}

--- This works!
local a, b = tuple[1], tuple[2]

--- This gets "integer" for "c", but "unknown" for "d:
local c, d = table.unpack(tuple)
```

### Actual Behaviour

```lua
---@alias my_tuple { [1]: integer, [2]: boolean }

---@type my_tuple
local tuple = {1, true}

--- "c" should be "integer" and "d" "boolean":
local c, d = table.unpack(tuple)
```

### Reproduction steps

1. Define tuple like I did
2. Create such tuple
3. `unpack` to two variables

### Additional Notes

I'm not sure if this is a feature that is even considered, but since I do use unpack sometimes to destructure tuples into their distinct variables, I feel this would be a good feature to have.

### Log File

_No response_

首先使用报告中的 tuple 和 table.unpack 示例重现问题，然后追踪 language server 对 multiple assignment 和 unpacked tables 的类型推断。没有指定源文件或测试；完成标准是该示例将 c 推断为 integer、将 d 推断为 boolean，同时不导致现有 tuple 诊断出现回归。

由索引模型根据 Issue 内容生成。