Create rds_instance_facts module using boto3.
Create common rds.py module_util library to be used by
rds_instance_facts and future RDS modules.
rds_instance_facts: use latest AWS helper methods
* Use `module.client` with `retry` to create AWS connection
* Return tags, using AWSRetry helper to backoff
* Use paginator to describe DB instances
* Further improve exception handling
* Fix RETURN documentation
update version_added
Co-authored-by: Michael De La Rue <jababubic.margoteen@spamgourmet.com>
Will Thames