Some additions and helpers for Kafka Streams interop

[99-not-out]

• added simple helpers in lambdas for using transformers more easily in a stream
• added the flatTransform and flatTransfromValues calls to the core streams interface
• added a helper function to add KV state stores to a streams builder

[kidpollo]

I might work with this one as this one looks newer :P

[99-not-out]

I might work with this one as this one looks newer :P

Yes @kidpollo - this one will be the merged version of these additions (and the other older PR is closed out now)

[kidpollo]

Cool cool thanks:)

On Wed, Nov 17, 2021 at 1:46 AM Matt Searle @.***> wrote:

I might work with this one as this one looks newer :P

Yes @kidpollo https://github.com/kidpollo - this one will be the merged version of these additions (and the other older PR is closed out now)

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[gphilipp]

Let's add a CHANGELOG entry