config option to disable monotonicity checks and on policy token id correction

**Is your feature request related to a problem? Please describe.**
Not all Nemo gym environments provide monotonic increasing trajectories (eg dropping reasoning in subsequent turns, multi-agent systems, etc). Currently, checks cause this to error. I would like a config parameter enforce_monotonicity to disable these checks. Along with this is replace_prefix_tokens, which could be disabled as a separate conflig flag, or bundled with this. I would like to disable this in the config as not all environments can propagate tokenids and logprobs for this (eg the current state of verifiers environments hub in nemo gym)

Monotonic check example: https://github.com/NVIDIA-NeMo/RL/blob/main/nemo_rl/models/generation/vllm/vllm_worker_async.py#L112

replace prefix tokens: https://github.com/NVIDIA-NeMo/RL/blob/main/nemo_rl/models/generation/vllm/vllm_worker_async.py#L40

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