add new option `overwrite_by_pkeys` for DynamoDB `batch_write_item`

[jetjinser]

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Describe the feature

like boto3: https://github.com/boto/boto3/blob/5eaa86735c78be7332fbc340813ba286a629f92b/boto3/dynamodb/table.py#L91 Avoid validation error "Provided list of item keys contains duplicates" when batch write item by auto de-dup.

Use Case

Now I have to manually remove duplicates, but AttributeValue does not implement the Eq, Ord and Hash traits, which complicates the implementation.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

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