AWS::DeploymentBucket - New Pseudo Parameter

### Name of the resource

Other

### Resource name

AWS::DeploymentBucket

### Description

Many AWS QuickStarts (and other solutions) rely on their own bucket name being passed into them as a parameter.

https://aws-quickstart.github.io/design-parms.html#qsconfig

This allows them to reference S3build artifacts as part of the deployment. E.g. Content for static websites.

However, it's a bit redundant. All CloudFormation stacks get deployed from S3. The simple addition of a new pseudo param which pointed to that deployment would allow developers to reference S3 resources without the need for a user-supplied parameter.

**Stretch goal**
Update `aws cloudformation package` to use this new parameter in place of hard-coded URIs. This would allow CloudFormation packages to be moved between buckets or even **in and out of an artifact repo** without breaking hard-coded references.

Start by reviewing the AWS Quick Starts parameter guidance linked in the issue and the behavior of AWS CloudFormation pseudo parameters. Then investigate how `aws cloudformation package` currently emits hard-coded S3 URIs; done means defining and implementing the new `AWS::DeploymentBucket` parameter, with the packaging update treated as a stretch goal.

Written by the indexing model from the issue text.