pipes: support Customer Managed Key for EventBridge pipes

[mazyu36]

Describe the feature

Amazon EventBridge Pipes now supports customer managed KMS keys.
But L2 Construct (alpha module) does not support it.

Ref: https://aws.amazon.com/about-aws/whats-new/2024/09/amazon-eventbridge-pipes-customer-managed-keys/

Use Case

When you want to use Customer Managed key to encrypt data.

Proposed Solution

Add kmsKey property to Pipe class.

Other Information

CloudFormation already support it, but L1 Construct does not yet.

I plan to implement L2 Construct after L1 Construct support it.

Acknowledgements

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

CDK version used

all

Environment details (OS name and version, etc.)

all

[pahud]

Thank you @mazyu36 !

[mazyu36]

I'm struggling with the implementation approach.

To minimize privileges in the CMK key policy, I need to set the Pipe ARN.
However, since the pipe name is optional, the exact ARN won't be known until deployment if the name isn't specified.

Currently, the only solution I can think of is using a custom resource.
If anyone knows a better method, please let me know.

https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-encryption-key-policy.html#eb-encryption-key-policy-pipe

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