feat(redshift_default_privileges): add role support

[Intuinewin]

This PR adds role support to the resource redshift_default_privileges. It also updates the code to use the table svv_default_privileges which contains the default privleges instead of the pg_default_acl table

Docs: https://docs.aws.amazon.com/redshift/latest/dg/r_SVV_DEFAULT_PRIVILEGES.html

[nico34638]

Hi @mmichaelb, do you have any news about this PR ?

[mmichaelb]

Thank you for your contribution! I am currently reviewing this and coming across the previous pg_default_acl table usage, it again makes clear that this provider originates from the postgres provider - good catch on adapting the new table as it seems.

/cc @nico34638

[mmichaelb]

The changes look good to me so far. In the next days, I will do some regression tests and after completing these tests, this feature can be merged. Due to the changes only adding a further option instead of changes an existing one, I would consider this a non breaking change.