AWS::EC2::Instance::BlockDeviceMapping::EBS should support throughput

### Name of the resource

AWS::EC2::Instance

### Resource name

AWS::EC2::Instance::BlockDeviceMapping::EBS

### Description

### 1. Title
AWS::EC2::Instance::BlockDeviceMapping::EBS should support throughput

### 2. Scope of request
AWS::EC2::Volume now supports the Throughput parameter for gp3. AWS::EC2::LaunchTemplate::LaunchTemplateData::BlockDeviceMapping::EBS also supports the Throughput parameter for gp3.
However, we cannot set the Throughput patameter in AWS::EC2::Instance::BlockDeviceMapping::EBS. CloudFormation needs support for this.

### 3. Expected behavior
In Create, it should allow us to set the Throughput parameter on AWS::EC2::Instance::BlockDeviceMapping::EBS .

### 4. Suggest specific test cases
When launching a new instance, we want to be able to configure the root volume to have the maximum possible throughput.

### 5. Helpful Links to speed up research and evaluation
LauncTemplate Throughput Support: https://docs.aws.amazon.com/en_us/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-launchtemplate-blockdevicemapping-ebs.html
EC2 Volume Throughput Support: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-ebs-volume.html
EC2 Instance Throughput Support missing: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-blockdev-template.html

### Other Details

_No response_

Start by comparing the linked AWS::EC2::Volume and AWS::EC2::LaunchTemplate::LaunchTemplateData::BlockDeviceMapping::EBS documentation with AWS::EC2::Instance::BlockDeviceMapping::EBS. Confirm how Throughput is represented for gp3 volumes, then verify that Create accepts it when configuring an instance root volume.

Written by the indexing model from the issue text.