New revision of the Assistant Panel (#10870)

This is a crate only addition of a new version of the AssistantPanel.
We'll be putting this behind a feature flag while we iron out the new
experience.

Release Notes:

- N/A

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Conrad Irwin <conrad@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Antonio Scandurra <antonio@zed.dev>
Co-authored-by: Nate Butler <nate@zed.dev>
Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Max <max@zed.dev>

crates/settings/src/settings.rs

@@ -2,6 +2,7 @@ mod keymap_file;
 mod settings_file;
 mod settings_store;
 
+use gpui::AppContext;
 use rust_embed::RustEmbed;
 use std::{borrow::Cow, str};
 use util::asset_str;
@@ -19,6 +20,14 @@ pub use settings_store::{
 #[exclude = "*.DS_Store"]
 pub struct SettingsAssets;
 
+pub fn init(cx: &mut AppContext) {
+    let mut settings = SettingsStore::default();
+    settings
+        .set_default_settings(&default_settings(), cx)
+        .unwrap();
+    cx.set_global(settings);
+}
+
 pub fn default_settings() -> Cow<'static, str> {
     asset_str::<SettingsAssets>("settings/default.json")
 }