[FEATURE] Truncation support for non vllm_server providers

## Feature Description

Add in support for the sampling_params variables truncation_side and truncate_prompt_tokens to the vllm, huggingface, litellm, and olmo_core providers to match the vllm_server implementation (https://github.com/allenai/olmo-eval/pull/208).

## Use Case

Currently, any setting of truncation_side or truncate_prompt_tokens for a non-vllm_server provider generates a warning. This limits providers that can be used for the safety judge, and any other length-limited model that is run

Compare the vllm_server implementation referenced in PR #208 with the vllm, huggingface, litellm, and olmo_core provider paths. Start by locating how sampling_params are handled and where warnings are generated for truncation_side and truncate_prompt_tokens. Done means these settings work for all four providers without the current warning.

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