Add support for AWS SNS(Simple Notification Service) notifications

[ethemcemozkan]

Please confirm the following

• I agree to follow this project's code of conduct.
• I have checked the current issues for duplicates.
• I understand that AWX is open source software provided for free and that I might not receive a timely response.

Feature type

New Feature

Feature Summary

Simple Notification Service is an AWS service that offers a messaging solution within AWS. Several resources can subscribe to topics and receive published messages and it is a commonly used service to integrate with other AWS services.
AWX already has extensive support for different notification types, such as Slack and Pagerduty. It might be a nice addition to add support for AWS SNS.

Select the relevant components

• UI
• API
• Docs
• Collection
• CLI
• Other

Steps to reproduce

It must be possible to:

• Create a new notification template with the type AWS SNS
• with required SNS Topic ARN, AWS Region fields
• enter optional Access Key ID, Access Key Secret, Session Token field
• When notification with this field is sent, a SNS message must be published.

Current results

Currently it is not possible to create notification templates with AWS SNS type.

Sugested feature result

A notification with this type must:

• must use optional Access Key ID, Access Key Secret, Session Token fields to authenticate or default to AWS SDK default chain
• be published to the defined SNS topic
• SNS event message field must contain a json body with job/workflow details,(existing Webhook data structure looks ideal)

Additional information

No response

[ethemcemozkan]

@TheRealHaoLiu I can help, #15184 is ready for review