Rename 'project_core' crate to 'worktree', make it just about worktrees (#9189)

This is just a refactor. I noticed that we now have a `project_core`
crate, which mainly contains the `Worktree` type and its private
helpers, plus the project's settings.

In this PR, I've renamed that crate to `worktree` and did some minor
simplification to its module structure. I also extracted a new
`WorktreeSettings` settings type from the `ProjectSettings`, so that the
worktree settings could live in the worktree crate. This way, the crate
is now exclusively about worktree logic.

Release Notes:

- N/A

crates/project/src/project.rs

@@ -2,6 +2,7 @@ pub mod debounced_delay;
 pub mod lsp_command;
 pub mod lsp_ext_command;
 mod prettier_support;
+pub mod project_settings;
 pub mod search;
 mod task_inventory;
 pub mod terminals;
@@ -56,9 +57,9 @@ use node_runtime::NodeRuntime;
 use parking_lot::{Mutex, RwLock};
 use postage::watch;
 use prettier_support::{DefaultPrettier, PrettierInstance};
-use project_core::project_settings::{LspSettings, ProjectSettings};
-pub use project_core::{DiagnosticSummary, ProjectEntryId};
+use project_settings::{LspSettings, ProjectSettings};
 use rand::prelude::*;
+use worktree::LocalSnapshot;
 
 use rpc::{ErrorCode, ErrorExt as _};
 use search::SearchQuery;
@@ -96,16 +97,20 @@ use util::{
     paths::{LOCAL_SETTINGS_RELATIVE_PATH, LOCAL_TASKS_RELATIVE_PATH},
     post_inc, ResultExt, TryFutureExt as _,
 };
+use worktree::{Snapshot, Traversal};
 
 pub use fs::*;
 pub use language::Location;
 #[cfg(any(test, feature = "test-support"))]
 pub use prettier::FORMAT_SUFFIX as TEST_PRETTIER_FORMAT_SUFFIX;
-pub use project_core::project_settings;
-pub use project_core::worktree::{self, *};
 #[cfg(feature = "test-support")]
 pub use task_inventory::test_inventory::*;
 pub use task_inventory::{Inventory, TaskSourceKind};
+pub use worktree::{
+    DiagnosticSummary, Entry, EntryKind, File, LocalWorktree, PathChange, ProjectEntryId,
+    RepositoryEntry, UpdatedEntriesSet, UpdatedGitRepositoriesSet, Worktree, WorktreeId,
+    WorktreeSettings, FS_WATCH_LATENCY,
+};
 
 const MAX_SERVER_REINSTALL_ATTEMPT_COUNT: u64 = 4;
 const SERVER_REINSTALL_DEBOUNCE_TIMEOUT: Duration = Duration::from_secs(1);
@@ -492,6 +497,7 @@ impl SearchMatchCandidate {
 
 impl Project {
     pub fn init_settings(cx: &mut AppContext) {
+        WorktreeSettings::register(cx);
         ProjectSettings::register(cx);
     }