DynamoDB: Add support for TransactWriteItems for boto3 resource

[perera-p]

We are using boto3 resource for dynamodb actions and TransactWriteItems would be incremental to make our db transactions robust. However the service resource does not support transact_write_items

It would be great if you can add this feature.

[kdaily]

Thanks for the feature request, @perera-p!

[lpsinger]

I need this for my project too. Should be fixed by: boto/boto3#4010

[refeed]

Any status update on this? Could someone take a look to the PR provided by @lpsinger ?

Currently, it's annoying to use the client interface, because we need to provide the types for each attributes, this is a nightmare for nested maps. I know there's a library for attaching the types, but it'd be much better if it's supported by boto3 natively via the resource interface

I came from https://stackoverflow.com/questions/61844796/can-we-use-transact-write-items-without-specifying-attribute-types