DynamoDbEnhancedClient: @DynamoDBGeneratedUuid support

[millems]

From #35:

V1 can automatically generate UUIDs for newly created records with the @DynamoDBGeneratedUuid annotation. This could be added as an extension to V2.

[debora-ito]

Implemented via PR #4810, released in SDK version 2.23.5.

[github-actions]

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