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/terminal_view/src/terminal_element.rs

@@ -1072,7 +1072,7 @@ impl Element for TerminalElement {
                                 color: *color,
                                 corner_radius: 0.15 * layout.dimensions.line_height,
                             };
-                            hr.paint(bounds, window);
+                            hr.paint(true, bounds, window);
                         }
                     }