Add role trust policy support for redshift serverless

[RoyMaunders]

This module can optionally create the 'dms-access-for-endpoint' role. It would be nice to add support for redshift-serverless to the roles trust policy.

https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Target.Redshift.html#CHAP_Target.Redshift.RSServerless

This requires a service principle of "redshift-serverless.amazonaws.com" in the trust policy.

Maybe add variable

'enable_redshift_serverless_target_permissions'

?

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