Dataset load for benchmarking

[LuvvAggarwal]

Added a utility for loading dataset from hugging face

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[HashemAlsaket]

Awesome work @LuvvAggarwal . Could you add an example with the changes added from PR #72 for review?

[HashemAlsaket]

We'll want to guard prompttools from requiring datasets to be installed as part of the requirements.

Suggested change:

try:
    from datasets import load_dataset_builder, load_dataset, get_dataset_config_names, Dataset
    from datasets.dataset_dict import DatasetDict
except ImportError:
    load_dataset = None

[HashemAlsaket]

Suggested change:

if load_dataset is None:
            raise ModuleNotFoundError(
                "Package `datasets` is required to be installed to use this experiment."
                "Please use `pip install datasets` to install the package"
            )