Make symbol_by_id a query again

Author: sharkdp

crates/red_knot_python_semantic/src/symbol.rs

@@ -369,6 +369,7 @@ fn symbol_impl<'db>(
     name: &str,
     requires_explicit_reexport: RequiresExplicitReExport,
 ) -> Symbol<'db> {
+    #[salsa::tracked]
     fn symbol_by_id<'db>(
         db: &'db dyn Db,
         scope: ScopeId<'db>,