Add file_finder module

Still need to wire up key bindings to make it toggle.

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

zed/src/workspace/workspace_view.rs

@@ -1,9 +1,8 @@
 use super::{pane, Pane, PaneGroup, SplitDirection, Workspace};
 use crate::{settings::Settings, watch};
-use gpui::{color::rgbu, ChildView};
 use gpui::{
-    elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MutableAppContext, View,
-    ViewContext, ViewHandle,
+    color::rgbu, elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MutableAppContext,
+    View, ViewContext, ViewHandle,
 };
 use log::{error, info};
 use std::{collections::HashSet, path::PathBuf};