fix: csv/tsv encoding

[jaluma]

Testing Unstructured with CSV/TSV files, I have encountered problems when the file is not UTF-8 encoded. With this fix, it is intended to fix problems if the client passes the right encoding. Tested with ISO-8859-1 files and it works as expected :)

Crash error: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf3 in position 80: invalid continuation byte

[sentry[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: unstructured/partition/csv.py

Function	Unhandled Issue
partition_csv	UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 54: invalid continuation byte ... Event Count: 3

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