Feature request: iterate over all entries in a cache

Feature request: iterate over all entries in a cache: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm using otter.Cache K, V and I'd like to be able to walk over every entry currently held in the cache (for example to dump the contents for debugging, export…

The task

I'm using `otter.Cache[K, V]` and I'd like to be able to walk over every entry currently held in the cache (for example to dump the contents for debugging, export them somewhere, or compute some aggregate over the values).

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.