Add image dimension and file size information (#21675)

Closes https://github.com/zed-industries/zed/issues/21281

@jansol, kindly take a look when you're free.


![image](https://github.com/user-attachments/assets/da9a54fa-6284-4012-a243-7e355a5290d3)

Release Notes:

- Added dimensions and file size information for images.

---------

Co-authored-by: tims <0xtimsb@gmail.com>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>

Cargo.lock

@@ -6363,6 +6363,8 @@ dependencies = [
  "file_icons",
  "gpui",
  "project",
+ "schemars",
+ "serde",
  "settings",
  "theme",
  "ui",