Add object parsing functionality (#13864)
* **Description:** Parses huggingface dataset Sequence objects into
strings for Document loading.
* **Issue:** Fixes #10674
* **Tag maintainter:** @baskaryan @eyurtsev
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Co-authored-by: Amy Han <amyhan@Amys-Air.lan>
Co-authored-by: Amy Han <amyhan@Amys-MacBook-Air.local>
