Feature Request: Implement "Waiter" Functionality for CodeDeploy Deployments

**Is your feature request related to a problem? Please describe.**

Our feature request is related to performing concurrent CodeDeploys within CircleCI. Although this (seems) to be a CodeDeploy limitation a solution could be implemented within the CircleCI orb.

Example text is below:

```
An error occurred (DeplovmentLimitExceededException) when calling the CreateDeployment operation: The Deployment Group "dashboard-dev-codedeploy-gro up (id-15682dbb-50a5-49d9-b83-12690133b83d)' already has an active Deployment 'd-BR8279BSO
```

**Describe the solution you'd like**

We would like it if the code-deploy-orb had "waiter" functionality available.

**Describe alternatives you've considered**

We have:

- contacted AWS to ask that they implement a CodeDeploy deployment queue [https://support.console.aws.amazon.com/support/home?region=us-west-2#/case/?displayId=13748568201&language=en](13748568201)
- reviewed open suggestions at CircleCI to see if a "queue" feature exists that would prevent two jobs from running concurrently (we found an orb that could do this)
- started the process of implementing a "waiter" ourselves

**Additional context**

We could provide a shell script that would accomplish this (we are implementing the waiter ourselves).