cookbook data loading doesn't match with the HF dataset data type

[Wendong-Fan]

in the https://github.com/camel-ai/loong/blob/main/cookbooks/env_with_generator.ipynb we added process_sample to convert string into dict, better approach would be update the HF dataset data type into dict natively

from camel.datasets import StaticDataset
from datasets import load_dataset
import json

# Load the dataset and select a specific split
dataset = load_dataset("camel-ai/loong", "graph_discrete_math", split="train")

# # Convert metadata from string to dict
# def process_sample(sample):
#     if isinstance(sample['metadata'], str):
#         sample['metadata'] = json.loads(sample['metadata'])
#     return sample

# # Apply the processing to all samples
# dataset = dataset.map(process_sample)

seed_dataset = StaticDataset(dataset)