AWS::EMR::Cluster - CapacityReservationOptions

### Name of the resource

AWS::EMR::Cluster

### Description

AWS::EMR::Cluster currently supports capacity reservations with instance fleets, as per documentation here[1].
Per documentation this feature can be configured with the following:

```
"LaunchSpecifications":
{"OnDemandSpecification": {
"AllocationStrategy": "lowest-price",
"CapacityReservationOptions":
{
"CapacityReservationPreference": "open"
}
}
}

```
The CapacityReservationOptions is currently not supported for AWS::EMR::Cluster in CloudFormation as per documentation here[2].

When testing the above in a CloudFormation template, the following error is received:
`"Encountered unsupported property CapacityReservationOptions"`

Requesting this feature be added as a supported property for AWS::EMR::Cluster in CloudFormation.

[1] https://docs.aws.amazon.com/emr/latest/ManagementGuide/on-demand-capacity-reservations.html
[2] https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-elasticmapreduce-cluster-ondemandprovisioningspecification.html

### Other Details

_No response_

Start with the AWS::EMR::Cluster documentation and the linked CloudFormation OnDemandProvisioningSpecification reference, then compare them with the EMR capacity-reservation documentation. Done means CloudFormation accepts CapacityReservationOptions under LaunchSpecifications.OnDemandSpecification and the example template no longer reports it as unsupported.

Written by the indexing model from the issue text.