Modified LLamaBatch to not share tokens with other sequences if logits is true. This ensures that the logit span at the end in used by exactly one sequence - therefore it's safe to mutate. This removes the need for copying _very_ large arrays (vocab size) and simplifies sampling pipelines.

* - Modified ISamplingPipeline to accept `ReadOnlySpan<float>` of logits directly. This moves responsibility to copy the logits into the pipeline.
 - Added a flag to `BaseSamplingPipeline` indicating if a logit copy is necessary. Skipping it in most cases.

* Fixed `RestoreProtectedTokens` not working if logit processing is skipped

* - Implemented a new greedy sampling pipeline (always sample most likely token)
 - Moved `Grammar` into `BaseSamplingPipeline`
 - Removed "protected tokens" concept from `BaseSamplingPipeline`. Was introducing a lot of incidental complexity.
 - Implemented newline logit save/restore in `DefaultSamplingPipeline` (only place protected tokens was used)

* Implemented pipelines for mirostat v1 and v2