identityCenterPermissionSets - Add PermissionSet Description Property

[jeffdickman]

Is your feature request related to a problem? Please describe.
Permission Sets have the property of "description" in CloudFormation. This doesn't exist in LZA currently.

Describe the feature you'd like
Please include this property as part of the configuration options for permission sets.

Additional context
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-sso-permissionset.html

[bhkhatri221]

Hello @jeffdickman, thank you for filing a feature request with the Landing Zone Accelerator team! Our team will evaluate the applicability of this request for a future release.

We will keep this issue open for tracking purposes and keep you aware of any status updates going forward. Thank you for supporting Landing Zone Accelerator!

[dbaileyut]

See #308