aws_connect: CfnInstanceStorageConfig to Enable exporting email messages to S3

### Describe the feature

https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_connect.CfnInstanceStorageConfig.html
The CfnInstanceStorageConfig enables storage for `CHAT_TRANSCRIPTS, CALL_RECORDINGS, SCHEDULED_REPORTS, MEDIA_STREAMS, CONTACT_TRACE_RECORDS, and AGENT_EVENTS`, but it does not support email messages.

### Use Case

Would be great if we can use cdk to enable exporting email messages to S3

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.1005.0

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

macos

Start with the AWS documentation for CfnInstanceStorageConfig linked in the issue and locate the aws_connect construct implementation in the CDK repository. Check how the existing storage types are represented and whether email-message export is supported by the underlying AWS resource specification. Done means CDK can configure email messages for export to S3 and the relevant construct coverage is updated.

Written by the indexing model from the issue text.