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/zlog/src/filter.rs

@@ -1,9 +1,8 @@
-use std::{
-    collections::{HashMap, VecDeque},
-    sync::{
-        OnceLock, RwLock,
-        atomic::{AtomicU8, Ordering},
-    },
+use collections::HashMap;
+use std::collections::VecDeque;
+use std::sync::{
+    OnceLock, RwLock,
+    atomic::{AtomicU8, Ordering},
 };
 
 use crate::{SCOPE_DEPTH_MAX, SCOPE_STRING_SEP_STR, Scope, ScopeAlloc, env_config, private};