aws-chatbot: make ISlackChannelConfiguration define addNotificationTopic(ITopic)

[mayconfrr]

Describe the feature

Right now you can only add topics if you create the chatbot slack configuration in the stack. You can't add topics to existing chatbot resources because SlackChannelConfiguration.fromSlackChannelConfigurationArn(...) returns an ISlackChannelConfiguration, which doesn't define the method to do so

Use Case

As a CDK developer
I want to add a notification topic to an existing chatbot slack resource through CDK
So that I don't have to manually add it using the AWS Console

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.87.0

Environment details (OS name and version, etc.)

Windows 10 Home Single Language, Version 22H2

[khushail]

Thanks @mayconfrr for submitting this feature request. I am marking this as P2 but you are welcome to submit a PR. Here is the contribution guide to get started.

[peterwoodworth]

Closing as duplicate of #21171

[github-actions]

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