paths: Replace lazy_static! with OnceLock (#13213)

This PR replaces the `lazy_static!` usages in the `paths` crate with
`OnceLock` from the standard library.

This allows us to drop the `lazy_static` dependency from this crate.

The paths are now exposed as accessor functions that reference a private
static value.

Release Notes:

- N/A

crates/rustdoc/src/store.rs

@@ -12,7 +12,6 @@ use gpui::{AppContext, BackgroundExecutor, Global, ReadGlobal, Task, UpdateGloba
 use heed::types::SerdeBincode;
 use heed::Database;
 use parking_lot::RwLock;
-use paths::SUPPORT_DIR;
 use serde::{Deserialize, Serialize};
 use util::ResultExt;
 
@@ -57,7 +56,10 @@ impl RustdocStore {
             .spawn({
                 let executor = executor.clone();
                 async move {
-                    RustdocDatabase::new(SUPPORT_DIR.join("docs/rust/rustdoc-db.0.mdb"), executor)
+                    RustdocDatabase::new(
+                        paths::support_dir().join("docs/rust/rustdoc-db.0.mdb"),
+                        executor,
+                    )
                 }
             })
             .then(|result| future::ready(result.map(Arc::new).map_err(Arc::new)))