Image viewer (#9425)

This builds on #9353 by adding an image viewer to Zed. Closes #5251.

Release Notes:

- Added support for rendering image files
([#5251](https://github.com/zed-industries/zed/issues/5251)).

<img width="1840" alt="image"
src="https://github.com/zed-industries/zed/assets/836375/3bccfa8e-aa5c-421f-9dfa-671caa274c3c">

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

crates/zed/Cargo.toml

@@ -46,6 +46,7 @@ fs.workspace = true
 futures.workspace = true
 go_to_line.workspace = true
 gpui.workspace = true
+image_viewer.workspace = true
 install_cli.workspace = true
 isahc.workspace = true
 journal.workspace = true

crates/zed/src/main.rs

@@ -15,6 +15,7 @@ use env_logger::Builder;
 use fs::RealFs;
 use futures::{future, StreamExt};
 use gpui::{App, AppContext, AsyncAppContext, Context, SemanticVersion, Task};
+use image_viewer;
 use isahc::{prelude::Configurable, Request};
 use language::LanguageRegistry;
 use log::LevelFilter;
@@ -165,6 +166,7 @@ fn main() {
         command_palette::init(cx);
         language::init(cx);
         editor::init(cx);
+        image_viewer::init(cx);
         diagnostics::init(cx);
         copilot::init(
             copilot_language_server_id,