Add support for self-managed AD domains for RDS-SQLServer AWS::RDS::DBInstance

### Name of the resource

AWS::RDS::DBInstance

### Resource name

_No response_

### Description

A new feature allows RDS-SQLServer to be joined to self-managed AD domains. See the documentation here: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_SQLServer_SelfManagedActiveDirectory.html

This leverages some new parameters on the CLI such as --domain-fqdn, --domain-ou, --domain-auth-secret-arn, and --domain-dns-ips.

These need to be added to the AWS::RDS::DBInstance resource.

### Other Details

_No response_

Start at the AWS::RDS::DBInstance resource definition and review the AWS documentation for self-managed Active Directory support. Add support for --domain-fqdn, --domain-ou, --domain-auth-secret-arn, and --domain-dns-ips, then verify that the resource accepts these parameters.

Written by the indexing model from the issue text.