util: Add persistent lists as a useful general-purpose thread-safe data

structure.

This will be used to improve our storage management for float lists.

components/util/lib.rs

@@ -45,6 +45,7 @@ pub mod logical_geometry;
 pub mod memory;
 pub mod namespace;
 pub mod opts;
+pub mod persistent_list;
 pub mod range;
 pub mod resource_files;
 pub mod rtinstrument;