feat(lambda-event-sources): starting position timestamp for kafka

[nikovirtala]

Issue # (if applicable)

Closes #31808

Reason for this change

It was impossible to start consuming a Kafka topic from a specific point in time.

Description of changes

The user may now set startingPositionTimestamp to ManagedKafkaEventSource and SelfManagedKafkaEventSource to start consuming a Kafka topic from a specific point in time.

Lambda and CloudFormation have supported the functionality for a while, and other stream event sources like KinesisEventSource already had a CDK implementation for it, so there's nothing new under the sky — just expanding it to cover sources we are using :)

Description of how you validated changes

The change is tested by adding similar unit tests to other event sources supporting this functionality.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[moelasmar]

could you please add a new GH issue as a Feature request, and link it to this issue.

[moelasmar]

IMO, this is a feature and not a chore, and it needs update in Readme, and new integration test case

[sumupitchayan]

Agreed with @moelasmar, this seems like a feat to me - @nikovirtala can you please add an integ test and README documentation on this?

[aws-cdk-automation]

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[aws-cdk-automation]

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[nikovirtala]

Agreed with @moelasmar, this seems like a feat to me - @nikovirtala can you please add an integ test and README documentation on this?

README is clear, but creating the integration test for this is a lot of work:

1. there are no existing integration tests for any other Event Source Mappings
2. testing Kafka Event Source Mapping requires creating an MSK cluster or such, which is not as trivial as creating a simple resource like DynamoDB Table (I hope there is something I can borrow from the MSK module, if one exist)

[nikovirtala]

Exemption Request

2. testing Kafka Event Source Mapping requires creating an MSK cluster or such, which is not as trivial as creating a simple resource like DynamoDB Table (I hope there is something I can borrow from the MSK module, if one exist)

Ok, the MSK module is in alpha state, and even that doesn't have an integration test that would create a topic and messages to the topic — which would be required to test this feature 😞

I doubt that creating all that is too much for me.

[aws-cdk-automation]

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