Show inline previews for LSP document colors (#32816)

https://github.com/user-attachments/assets/ad0fa304-e4fb-4598-877d-c02141f35d6f

Closes https://github.com/zed-industries/zed/issues/4678

Also adds the code to support `textDocument/colorPresentation`
counterpart that serves as a resolve mechanism for the document colors.
The resolve itself is not run though, and the editor does not
accommodate color presentations in the editor yet — until a well
described use case is provided.

Use `lsp_document_colors` editor settings to alter the presentation and
turn the feature off.

Release Notes:

- Start showing inline previews for LSP document colors

crates/editor/src/display_map.rs

@@ -2014,11 +2014,11 @@ pub mod tests {
         map.update(cx, |map, cx| {
             map.splice_inlays(
                 &[],
-                vec![Inlay {
-                    id: InlayId::InlineCompletion(0),
-                    position: buffer_snapshot.anchor_after(0),
-                    text: "\n".into(),
-                }],
+                vec![Inlay::inline_completion(
+                    0,
+                    buffer_snapshot.anchor_after(0),
+                    "\n",
+                )],
                 cx,
             );
         });