lsp: Complete overloaded signature help implementation (#33199)

This PR revives zed-industries/zed#27818 and aims to complete the
partially implemented overloaded signature help feature.

The first commit is a rebase of zed-industries/zed#27818, and the
subsequent commit addresses all review feedback from the original PR.

Now the overloaded signature help works like


https://github.com/user-attachments/assets/e253c9a0-e3a5-4bfe-8003-eb75de41f672

Closes #21493

Release Notes:

- Implemented signature help for overloaded items. Additionally, added a
support for rendering signature help documentation.

---------

Co-authored-by: Fernando Tagawa <tagawafernando@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/markdown/src/markdown.rs

@@ -421,7 +421,7 @@ impl Selection {
     }
 }
 
-#[derive(Clone, Default)]
+#[derive(Debug, Clone, Default)]
 pub struct ParsedMarkdown {
     pub source: SharedString,
     pub events: Arc<[(Range<usize>, MarkdownEvent)]>,
@@ -1672,7 +1672,7 @@ struct RenderedText {
     links: Rc<[RenderedLink]>,
 }
 
-#[derive(Clone, Eq, PartialEq)]
+#[derive(Debug, Clone, Eq, PartialEq)]
 struct RenderedLink {
     source_range: Range<usize>,
     destination_url: SharedString,