file_finder: Display file icons (#18091)

This PR adds file icons (like in tabs, the project panel and tab
switcher) to the file finder popup.

It's similar to [tab_switcher
icons](https://github.com/zed-industries/zed/pull/17115), but simpler,
because we're only dealing with actual files.

Release Notes:

- Added icons to the file finder.

Screenshot:

![image](https://github.com/user-attachments/assets/bd6a54c1-cdbd-415a-9a82-0cc7a0bb6ca2)

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/file_finder/src/file_finder_settings.rs

@@ -0,0 +1,27 @@
+use anyhow::Result;
+use schemars::JsonSchema;
+use serde_derive::{Deserialize, Serialize};
+use settings::{Settings, SettingsSources};
+
+#[derive(Deserialize, Debug, Clone, Copy, PartialEq)]
+pub struct FileFinderSettings {
+    pub file_icons: bool,
+}
+
+#[derive(Clone, Default, Serialize, Deserialize, JsonSchema, Debug)]
+pub struct FileFinderSettingsContent {
+    /// Whether to show file icons in the file finder.
+    ///
+    /// Default: true
+    pub file_icons: Option<bool>,
+}
+
+impl Settings for FileFinderSettings {
+    const KEY: Option<&'static str> = Some("file_finder");
+
+    type FileContent = FileFinderSettingsContent;
+
+    fn load(sources: SettingsSources<Self::FileContent>, _: &mut gpui::AppContext) -> Result<Self> {
+        sources.json_merge()
+    }
+}