aws-autoscaling: the ability to set an kmsKey for encryption of ebs volumes

### Describe the feature

It looks like that there is no option to set the kmsKey prop for Autoscaling Group volumes. See https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-autoscaling/lib/volume.ts

In the ec2 volume.ts file it is, see https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ec2/lib/volume.ts#L132

### Use Case

to encrypt ebs volumes in autoscaling groups

### Proposed Solution

adding the property to the `volume.ts` file in the autoscaling group module

### Other Information

example showing the difference:

``` typescript
import { App, Stack, StackProps } from 'aws-cdk-lib';
import {
Instance,
InstanceClass,
InstanceSize,
InstanceType,
MachineImage,
BlockDeviceVolume as EC2BDV,
EbsDeviceVolumeType as EC2EVT,
Vpc,
} from 'aws-cdk-lib/aws-ec2';
import {
AutoScalingGroup,
BlockDeviceVolume as ASGBDV,
EbsDeviceVolumeType as ASGEVT,
} from 'aws-cdk-lib/aws-autoscaling';
import { Key } from 'aws-cdk-lib/aws-kms';

export class ServerStack extends Stack {
constructor(scope: App, id: string, props: StackProps) {
super(scope, id, props);

const vpc = new Vpc(this, 'vpc-id');
const kmsKey = new Key(this, 'kmsKey', {});

new AutoScalingGroup(this, 'ASG', {
instanceType: InstanceType.of(InstanceClass.M7I, InstanceSize.XLARGE),
machineImage: MachineImage.latestAmazonLinux2023(),
vpc,
blockDevices: [
{
deviceName: '/dev/sda1',
volume: ASGBDV.ebs(150, {
volumeType: ASGEVT.GP3,
throughput: 250,
kmsKey: kmsKey, // this property does not exist
}),
},
],
});

new Instance(this, 'EC2', {
instanceType: InstanceType.of(InstanceClass.M7I, InstanceSize.XLARGE),
machineImage: MachineImage.latestAmazonLinux2023(),
vpc,
blockDevices: [
{
deviceName: '/dev/sda1',
volume: EC2BDV.ebs(150, {
volumeType: EC2EVT.GP3,
throughput: 250,
kmsKey: kmsKey,
}),
},
],
});
}
}
```

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.263.0

### AWS CDK CLI version

2.1134.0

### Environment details (OS name and version, etc.)

node 24 on macOS

Start in packages/aws-cdk-lib/aws-autoscaling/lib/volume.ts and compare its EBS volume options with packages/aws-cdk-lib/aws-ec2/lib/volume.ts at the referenced line. Add support for the KMS key option in autoscaling volumes and verify that the example can pass kmsKey and produce encrypted EBS volumes.

Written by the indexing model from the issue text.