Move PRMTrainer to trl.experimental.prm #4483
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This PR moves PRMTrainer and PRMConfig to the experimental module as part of the TRL V1 refactoring effort.
Changes
trl.experimental.prmmodule with PRMTrainer and PRMConfigtrl.trainerwith FutureWarning (removal in TRL 0.29.0)Migration pattern
Follows the same pattern used for PPO migration.
Contributes to #4374
Fixes #4467