Settings refactor (#38367)

Co-Authored-By: Ben K <ben@zed.dev>
Co-Authored-By: Anthony <anthony@zed.dev>
Co-Authored-By: Mikayla <mikayla@zed.dev>

Release Notes:

- settings: Major internal changes to settings. The primary user-facing
effect is that some settings which did not make sense in project
settings files are no-longer read from there. (For example the inline
blame settings)

---------

Co-authored-by: Ben Kunkle <ben@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>
Co-authored-by: Anthony <anthony@zed.dev>

crates/settings/src/settings.rs

@@ -1,12 +1,15 @@
 mod base_keymap_setting;
 mod editable_setting_control;
 mod keymap_file;
+mod settings_content;
 mod settings_file;
 mod settings_json;
 mod settings_store;
 mod settings_ui_core;
 mod vscode_import;
 
+pub use settings_content::*;
+
 use gpui::{App, Global};
 use rust_embed::RustEmbed;
 use std::{borrow::Cow, fmt, str};
@@ -21,8 +24,7 @@ pub use keymap_file::{
 pub use settings_file::*;
 pub use settings_json::*;
 pub use settings_store::{
-    InvalidSettingsError, LocalSettingsKind, Settings, SettingsKey, SettingsLocation,
-    SettingsSources, SettingsStore,
+    InvalidSettingsError, LocalSettingsKind, Settings, SettingsKey, SettingsLocation, SettingsStore,
 };
 pub use settings_ui_core::*;
 // Re-export the derive macro
@@ -75,10 +77,7 @@ impl fmt::Display for WorktreeId {
 pub struct SettingsAssets;
 
 pub fn init(cx: &mut App) {
-    let mut settings = SettingsStore::new(cx);
-    settings
-        .set_default_settings(&default_settings(), cx)
-        .unwrap();
+    let settings = SettingsStore::new(cx, &default_settings());
     cx.set_global(settings);
     BaseKeymap::register(cx);
     SettingsStore::observe_active_settings_profile_name(cx).detach();