add ui::Vector and separate images from icons (#17815)

This PR pulls non-icon assets out of `ui::components::icon` in
preparation for icon standardization.

In the future icons will have standard names and sizes, and these image
assets won't conform to those constraints.

We can also add a `ui::components::image::Image` wrapper around the
`gpui::img` element in the future for any Zed-specific image styling we
want to enforce.

Of note:

```rust
#[derive(Debug, PartialEq, Eq, Copy, Clone, EnumIter, EnumString, IntoStaticStr, Serialize, Deserialize, DerivePathStr)]
#[strum(serialize_all = "snake_case")]
#[path_str(prefix = "images", suffix = ".svg")]
pub enum VectorName {
    ZedLogo,
    ZedXCopilot,
}
```

You can see in the above code we no longer need to manually specify
paths for image/icon enums like we currently do in
`ui::components::icon`.

The icon component will get this same treatment in the future, once we:

- do the design work needed to standardize the icons
- remove unused icons
- update icon names

Release Notes:

- N/A

crates/ui/src/components.rs

@@ -7,6 +7,7 @@ mod divider;
 mod dropdown_menu;
 mod facepile;
 mod icon;
+mod image;
 mod indicator;
 mod keybinding;
 mod label;
@@ -37,6 +38,7 @@ pub use divider::*;
 pub use dropdown_menu::*;
 pub use facepile::*;
 pub use icon::*;
+pub use image::*;
 pub use indicator::*;
 pub use keybinding::*;
 pub use label::*;
@@ -55,5 +57,7 @@ pub use tab_bar::*;
 pub use tool_strip::*;
 pub use tooltip::*;
 
+#[cfg(feature = "stories")]
+pub use image::story::*;
 #[cfg(feature = "stories")]
 pub use stories::*;