add implementation for UpdateItem

[csongor-halmai-oolio]

This PR implements the UpdateItem() functionality for DynamoDB. It has a decent amount of unit tests as well.

Summary by CodeRabbit

• New Features
  • Added support for updating items in DynamoDB, including setting update expressions, keys, and optional request settings like return values and condition handling.
  • Added flexible request options to customize update behavior.
• Tests
  • Added coverage for update scenarios such as inserts, updates, increments, and conditional failures.

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Latest commit: 3016a5d

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