Sketch in a table for the keybindings UI (#32436)

Adds the initial semblance of a keymap UI. It is currently gated behind the `settings-ui` feature flag. Follow up PRs will add polish and missing features.

Release Notes:

- N/A

---------

Co-authored-by: Ben Kunkle <ben@zed.dev>
Co-authored-by: Anthony <anthony@zed.dev>

crates/workspace/src/theme_preview.rs

@@ -5,8 +5,8 @@ use theme::all_theme_colors;
 use ui::{
     AudioStatus, Avatar, AvatarAudioStatusIndicator, AvatarAvailabilityIndicator, ButtonLike,
     Checkbox, CheckboxWithLabel, CollaboratorAvailability, ContentGroup, DecoratedIcon,
-    ElevationIndex, Facepile, IconDecoration, Indicator, KeybindingHint, Switch, Table, TintColor,
-    Tooltip, element_cell, prelude::*, string_cell, utils::calculate_contrast_ratio,
+    ElevationIndex, Facepile, IconDecoration, Indicator, KeybindingHint, Switch, TintColor,
+    Tooltip, prelude::*, utils::calculate_contrast_ratio,
 };
 
 use crate::{Item, Workspace};