AWS::AutoScaling::AutoScalingGroup - MixedInstancesPolicy.Overrides.WeightedCapacity

## 2. Scope of request

In CloudFormation, I should be able to define per-instance-type WeightedCapacity overrides that allow me to take advantage of the recently announced [instance-weighting feature](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-weighting.html). To align with the API, this should be specified in CloudFormation as a property of a [LaunchTemplateOverride](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_LaunchTemplateOverrides.html).

## 3. Expected behavior

On Create or update, CloudFormation should perform an AutoScaling API call that includes the WeightedCapacity for each LaunchTemplateOverride specified in the AutoScalingGropup's MixedInstancesPolicy.LaunchTemplate.Overrides list.

## 4. Suggest specific test cases

N/A

## 5. Helpful Links to speed up research and evaluation

- [EC2 AutoScaling documentation for instance weighting](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-instance-weighting.html)
- [API reference defining the WeightedCapacity property of a LaunchTemplateOverride](https://docs.aws.amazon.com/autoscaling/ec2/APIReference/API_LaunchTemplateOverrides.html)
- [CloudFormation documentation where the WeightedCapacity parameter should appear](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-autoscaling-autoscalinggroup-launchtemplateoverrides.html)

## 6. Category (required) - Will help with tagging and be easier to find by other users to +1

Compute.