Add iam_database_authentication_enabled to db_instance

[gabrielamaximino]

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Summary

Hi, I noticed the parameter iam_database_authentication_enabled is not being used on resource "aws_db_instance" "rds_db". It's only used on resource "aws_rds_cluster" "aurora_cluster". So I suggest to add this parameter to db instance too :)

Motivation

I needed to use this parameter on db instance but it didn't have, so I have to clone this repository, edit and use it as a local module instead of a remote one :/ it's preferable that the module add this parameter to avoid doing this

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[gabrielamaximino]

Obs: the parameter apply_immediately is not being used on aurora cluster resource too.

[brunodasilvalenga]

@gabrielamaximino Are you able to open a PR with those changes?