AWS::Redshift::UsageLimit

## 1. Title
AWS::Redshift::UsageLimit

## 2. Scope of request
Support the definition of Redshift usage limits [1] in CloudFormation.

Create a new resource type for the Amazon Redshift service that allows the creation of the Usage Limits for a new or existing cluster. e.g. AWS::Redshift::UsageLimit

## 3. Expected behavior

On CREATE, the new resource will create a Spectrum or Concurrency usage limit for the specified cluster
On UPDATE, the new resource will update an existing Spectrum or Concurrency usage limit for the specified cluster
On DELETE, the new resource will delete a Spectrum or Concurrency usage limit that is defined for the specified cluster

## 4. Suggest specific test cases

## 5. Helpful Links to speed up research and evaluation
[1] https://docs.aws.amazon.com/redshift/latest/mgmt/managing-cluster-usage-limits.html
https://docs.aws.amazon.com/redshift/latest/APIReference/API_CreateScheduledAction.html
https://aws.amazon.com/about-aws/whats-new/2020/03/amazon-redshift-launches-pause-resume/
https://docs.aws.amazon.com/redshift/latest/mgmt/managing-cluster-operations.html#rs-mgmt-pause-resume-cluster

## 6. Category
3. DB (Amazon Redshift)

## 7. Any additional context (optional)