feat(appconfig): support customer managed key for hosted configuration

[mazyu36]

Issue # (if applicable)

N/A

Reason for this change

Missing property.

Description of changes

Add kmsKey property to AppConfig Hosted Configuration

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Add a unit test and an integ test.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[badmintoncryer]

Thank you for your contribution! I've added only a nit comment.

[badmintoncryer]

@mazyu36 I'm curious that is it unnecessary to set a key policy for CMK?
In the documentation, there was an introduction to resource policy settings with some Role as a Principal, but I couldn't understand what role it was.

{
    "Version": "2012-10-17",
    "Statement": [
        {
        "Sid": "Allow use of the key",
        "Effect": "Allow",
        "Principal": {
            "AWS": "arn:aws:iam::account_ID:role/role_name" // this
        },
        "Action": [
            "kms:Decrypt",
            "kms:GenerateDataKey"
            ],
        "Resource": "*"
        }
 ]

[mazyu36]

@badmintoncryer
In my understanding, for roles that use Hosted Configuration with CMK, it is necessary to grant permission for the CMK in the key policy.

Hosted Configuration itself does not have roles.

[QuantumNeuralCoder]

What if props is undefined.

[mazyu36]

The kmsKeyIdentifier is set to undefined.
In that case, the configuration is encrypted by AWS Managed Key.

[QuantumNeuralCoder]

do we need to do this instead props?.kmsKey?.keyArn

[mazyu36]

I think this is not needed because props is required.

aws-cdk/packages/aws-cdk-lib/aws-appconfig/lib/configuration.ts

Line 442 in 29a0329

constructor(scope: Construct, id: string, props: HostedConfigurationProps) {

The other properties are same.

aws-cdk/packages/aws-cdk-lib/aws-appconfig/lib/configuration.ts

Line 462 in 29a0329

this.content = props.content.content;

[QuantumNeuralCoder]

Minor comment added above

[aws-cdk-automation]

This PR cannot be merged because it has conflicts. Please resolve them. The PR will be considered stale and closed if it remains in an unmergeable state.

Pull request has been modified.

[aws-cdk-automation]

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[mazyu36]

Exemption Request: I'm waiting for the maintainer's response.

[aws-cdk-automation]

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