Feedback on Expandable hovers for JavaScript and TypeScript

Type: Feature Request

Should you show function overloads on hover expansion ?

e.g. for `Url.parse` :

Initial hover :

```typescript
function parse(urlString: string, parseQueryString: true, slashesDenoteHost?: boolean | undefined): Url.UrlWithParsedQuery (+3 overloads)
...
```

Hover expanded :

```typescript
function parse(urlString: string): UrlWithStringQuery;
function parse(
urlString: string,
parseQueryString: false | undefined,
slashesDenoteHost?: boolean,
): UrlWithStringQuery;
function parse(urlString: string, parseQueryString: true, slashesDenoteHost?: boolean): UrlWithParsedQuery;
function parse(urlString: string, parseQueryString: boolean, slashesDenoteHost?: boolean): Url;
...
```

VS Code version: Code 1.103.2 (6f17636121051a53c88d3e605c491d22af2ba755, 2025-08-20T16:45:34.255Z)
OS version: Linux x64 6.8.0-55-generic
Modes:

该 issue 提供了一个 TypeScript/JavaScript hover 示例，但没有指出源文件、测试或实现入口。首先定位语言服务的 hover 处理逻辑和现有的 hover 展开测试，然后确认展开函数 hover 后会显示其 overloads，同时初始 hover 仍保持简洁。

由索引模型根据 Issue 内容生成。