AWS::MSK::NewResource - ClusterConfiguration

## 1. AWS::MSK::NewResource-ClusterConfiguration

## 2. Scope of request
Support for MSK Configuration
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/kafka.html#Kafka.Client.create_configuration

## 3. Expected behavior

I can create a new MSK configuration and !Ref it to my Cluster.

## 4. Suggest specific test cases

Create a new Configuration and associate with one or many MSK cluster(s)

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

boto3 API Docs: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/kafka.html#Kafka.Client.create_configuration

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

Integration

Start with the linked boto3 Kafka create_configuration API documentation and compare its inputs with the requested MSK Configuration resource. Verify how a created Configuration can be associated with one or more MSK clusters and referenced with !Ref. Done means the resource can create a configuration, associate it with clusters, and pass the suggested creation and association tests.

Written by the indexing model from the issue text.