fix: add input validation to chunks() for size < 1

[KooshaPari]

Bug

chunks() with size=0 or negative size raised an unhelpful ValueError: Stop argument for islice() must be None or an integer: 0 <= x <= sys.maxsize instead of a clear error message.

Fix

Added input validation at the start of chunks() that raises ValueError with a descriptive message: "chunk size must be at least 1, got {size}".

Testing

• Added test_chunks_size_zero_raises to verify size=0 raises ValueError
• Added test_chunks_negative_size_raises to verify negative sizes raise ValueError
• All 21 tests in test_utils.py pass

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📚 Documentation preview 📚: https://sqlite-utils--864.org.readthedocs.build/en/864/

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