Add support for SNS alarms and dashboard

[direnakkoc]

Description

Add support for SNS alarms and dashboard for the metrics are

• NumberOfNotificationsFilteredOut-InvalidAttributes
• NumberOfNotificationsFailed

Motivation and Context

• NumberOfNotificationsFilteredOut-InvalidAttributes - This metric keeps track of messages that were filtered out because they carried invalid or malformed attributes and, thus, didn’t match the subscription filter policy.

• NumberOfNotificationsFailed – This last metric tracks all the messages that failed to be delivered to subscribing endpoints, regardless of whether a filter policy had been set for the endpoint. This metric is emitted after the message delivery retry policy is exhausted, and SNS stops attempting to deliver the message. At that moment, the subscribing endpoint is likely no longer reachable. For example, the subscribing SQS queue or Lambda function has been deleted by its owner. You may want to closely monitor this metric to address message delivery issues quickly.

How Has This Been Tested?

• Unit test added
• Integration test is completed

Screenshots (if appropriate):

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

Coverage decreased (-100.0%) to 0.0% when pulling 6e8e217 on sns-metrics into 18c409e on main.

[eoinsha]

Node.js has a built-in https module, so I don't think we need to add an NPM module. Does it add anything?
I'd like to suggest replacing this with axios in any case and changing the handler to use async/await.

[eoinsha]

LTGM!