(iotevents): Add aws-iotevents AlarmModel L2 Constructs

### Describe the feature

L2 Constructs for [AWS::IoTEvents::AlarmModel](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-iotevents-alarmmodel.html)

### Use Case

To allow users to use L2 constructs for [AWS::IoTEvents::AlarmModel](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-iotevents-alarmmodel.html).

### Proposed Solution

I suspect it should be implemented similar to how [DetectorModel](https://docs.aws.amazon.com/cdk/api/v2/docs/@aws-cdk_aws-iotevents-alpha.DetectorModel.html) is implemented. Thought it might need its own actions package.

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.46.0

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

Linux

Read the AWS::IoTEvents::AlarmModel documentation and compare the existing DetectorModel construct and API. Determine whether an actions package is needed, then verify that the AlarmModel L2 construct covers the documented resource properties and synthesizes correctly.

Written by the indexing model from the issue text.