Add try_original_type to DatasetDict.map
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_7544). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update. Sure! I just committed the changes @lhoestq 
Let me know if there are other things to do before merge or other places to add `try_original_type` argument 
This PR resolves #7472 for DatasetDict 

The previously merged PR #7483 added `try_original_type` to ArrowDataset, but DatasetDict misses `try_original_type`

Cc: @lhoestq 