powerset of sets() does not support a baseset parameter

powerset of sets() does not support a baseset parameter: a task in Repo2RLEnv R2E-Gym / SWEGEN (Harbor dataset). The powerset of sets() function always yields plain set objects. There is no way to request frozenset outputs, which means the results can't be collected into a set (since set is not…

The task

The `powerset_of_sets()` function always yields plain `set` objects. There is no way to request `frozenset` outputs, which means the results can't be collected into a `set` (since `set` is not hashable).

Part of FineEnvs/repo2rlenv-r2e-gym.