feat(kms): import an Alias by name

[njlynch]

Supports importing an Alias by alias name only, without the underlying reference
to the Key ARN. Useful in scenarios where only the alias is needed in a
reference by a Construct.

fixes #5953

---

Tested via a simple repro script:

    const key = kms.Alias.fromAliasName(this, 'myKey', 'alias/myTestKey');
    new cloudtrail.Trail(this, 'CloudTrail', {
        sendToCloudWatchLogs: true,
        kmsKey: key
    });

---

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

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[skinny85]

Looks good, but I'd like to go a step further in making this more usable 🙂.

Pull request has been modified.

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[skinny85]

Love it, thanks a lot @njlynch !

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[Aarbel]

@njlynch

const key = kms.Alias.fromAliasName(this, 'myKey', 'alias/myTestKey');

By myKey you mean KMS' keyId or key ARN ?

[skinny85]

Pretty sure Nick meant 'myKey' as a string - a resource identifier.

[Aarbel]

Pretty sure Nick meant 'myKey' as a string - a resource identifier.

Thanks @skinny85, i name it rdsKmsKeyForPerformanceInsights