aws-backup: S3 backup tiering

### Describe the feature

AWS Backuplower-cost warm storage tier for Amazon S3 backups, see
https://docs.aws.amazon.com/aws-backup/latest/devguide/backup-tiering.html

### Use Case

Missing construct (otherwise I missed it, then sorry).

### Proposed Solution

AWS CLI example:

```bash
aws backup update-tiering-configuration \
--tiering-configuration-name "MyTieringConfig" \
--tiering-configuration '{
"BackupVaultName":"*",
"ResourceSelection":[{
"Resources":["*"],
"TieringDownSettingsInDays":60,
"ResourceType":"S3"
}]
}'
```

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

2.231.0

### AWS CDK CLI version

2.1033.0

### Environment details (OS name and version, etc.)

macOS

Start with the AWS Backup tiering documentation and the `update-tiering-configuration` CLI example in the issue. Then inspect the repository's existing AWS Backup constructs to determine the appropriate entry point; done means exposing S3 backup tiering configuration equivalent to the documented settings.

Written by the indexing model from the issue text.