Deploy lambda to batch up compaction commits

[patchwork01]

Background

Split from:

• Unordered batch commit queue for compaction jobs #3686

Follows on from:

• Lambda handler to batch up compaction commits #3905

Description

We'd like to deploy the lambda from the previous issue with the CDK, along with an SQS queue to trigger it.

Analysis

It would be nice to be able to configure the lambda memory and timeout in instance properties. We'll need CDK-defined instance properties for the new queue.

We'll need to add the lambda to the LambdaHandler definitions. We'll need to add the queue to the SqsQueues definitions.